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The 8 Best boating plumbing fittings of 2024

Are you trying to find boating plumbing fittings among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling boating plumbing fittings on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 15 hours of research and did 36 boating plumbing fittings tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best boating plumbing fittings you can buy today

No. 1
Attwood 3877-3 Polypropylene 90-Degree Thru-Hull Connector, White Finish
  • Ensures a reliable thru-hull connection
  • Fits ¾ inch inside diameter hose
  • Max Hull Thickness: 1 inch
  • Flange Diameter: 1-1/2 inch
  • Requires 1 inch installation hole
No. 2
attwood unisex adult 1/2 inch boating plumbing fittings, Brass, One Size US
  • Creates reliable watertight seal
  • Fits 1/2 inch inside diameter thru hull
  • Cam action lever flips down to lock
  • Brass construction resists corrosion
  • Not for use with chemicals or fuels
  • For 7/16" I.D. thru-hull
  • Ideal for livewell drains
  • Brass snaps and plates
  • Note: Not for use with chemicals or fuels
SaleNo. 3
Five Oceans FO1866 White Straight Thru-Hull Fitting Connection for Hose, 1/2 inches, Injection Molded Polypropylene, Barbed, Resist Harsh Conditions
  • This Five Oceans Thru-Hull Fitting Connection for Hose is ideal for scupper, sink drain, and bilge pump overboard discharge. Hose Diameter: 1/2 inches (13mm).
  • It is made of tough injection molded Polypropylene plastic that will resist sunlight, salt water, oil, gasoline and most common marine chemicals
  • Nylon plumbing fittings like this cost less than similar fittings made of Marelon or Bronze.
  • Excellent resistance to UV and weather-aging
  • Thru-Hull Connections For Use With Hose Are Not Recommended For Use Below The Waterline. FIVE OCEANS, 40 Years Developing High-Quality Marine & Outdoor Products
No. 4
ISURE MARINE Stainless Steel Barbed Standard Length Straight Thru-Hull Marine Barbed Hose Thru Drain Connector 1" w/Nut Boat Plumbing Fittings for Boats, Yachts, Marine
  • ✔Standard Thread has full length thread for thick hulls and easy tightening;Inner Dia. 1''
  • ✔Material: High quality and purity 316 Stainless Steel, Surface: Mirror polished/High polish finish.
  • ✔SIZE: Overall Length: 101 mm, Thread Length:Approx: 2.3"(58mm) , Barb length: 1.4"(36 mm), Hole diameter: 1"(25.4 m);Outside flange diameter:Approx: 2.2"(56mm), Barb diameter: 1''(25.4 mm), Thread O.D:Approx 1.3"(33mm), Weight: 330 g
  • ✔The size of steel drain hull tube is relatively versatile, so it fits in some corners and narrow areas.Easy to install and disassemble.
  • ✔RISK-FREE purchase! If you have any issues ,please feel free to contact us 24-Hour Customer Supports.
No. 5
attwood unisex adult Through-Hulls boating plumbing fittings, White, One Size US
  • Ensures a reliable thru-hull connection
  • Fits ¾ inch inside diameter hose
  • Stem Length: 3-1/4 inch
  • Max Hull Thickness: 1-1/4 inch
  • Flange diameter: 2-1/4 inch
SaleNo. 6
2 Pieces 0.75" Yacht Drain Pipe Tube Thru Hull Boat Plumbing Fittings Spare Parts for Baitwell Motorwell(Diameter 3/4 in.)
  • Material:Motorwell Drain Tube Thru Hull made of high quality Nylon
  • Application:Fits 1 inch diameter openings and bulkheads from 3/4 inches to 2 1/2 inches thick
  • Features:Drain fittings have coaxial rings for precise locking for a completely leak-tight seal
  • Package includes 2 piece of 3/4 Inches Pipe Drain Tube Thru Hull
  • Measures 3-5/32" (80mm) x 15/16" (21mm)
No. 7
316 Stainless Steel Boat Thru Hull Fitting Hose Barb with Nut,Marine Hardware Accessories for Boats Drain Pipe Yacht Bilge Boat Plumbing Fittings (Type: Half Thread,Horse ID Size:3/8")
  • -High Quality: Heavy duty 316 grade stainless steel construction ensures its strength and durability.

  • -Scope of Application: High reliability, widely used in boats, yachts, marine, cars,trailer, etc.

  • -Good Performance: Surface with mirror polishing finish, strong corrosion resistance in the saltwater environment.

  • -Installation: A compact size allowing installation near corners and in confined areas.

  • Package Included:

    1 x Boat Half Thread Thru Hull Fitting

    1x Rubber gasket of matching size

No. 8
keehui 316 Stainless Steel Durable Combo 1-1/4 I.D.Thru-Hull Fitting w/Nut with Custom Gasket Boat Plumbing Fittings for Boats, Yachts, Marine
  • Material: Marine Grade 316 Stainless Steel Solid metal slab, Heavy Duty ,very strong, durable
  • Customized gasket is more convenient to install
  • Flange O.D:2-1/2"(62.5mm);Thread Length: APPROX.1-3/4"(44.5MM)Barb Length: 1-1/8"
  • Horse ID Size:1-1/4" The detail size refer to the left pictures
  • Thread O.D:Approx 1-5/8"
No. 9
Attwood 3874-3 Polypropylene Durable Thru-Hull Connector Fitting, White Finish
  • Ensures a reliable thru-hull connection
  • Fits 1-1/8 inch to 1-1/4 inch inside diameter hose
  • Stem Length: 3-1/4 inch
  • Max Hull Thickness: 1-1/4 inch
  • Requires 1-3/8 inch installation hole
No. 10
Mtsooning Boat Thru-Hull Connector, 3/4 inch Steel Straight Thru Drain Fittings with Barb, Marine Transom Drain Tube Pipe Nut Accessories
84 Consomer Reviews
Mtsooning Boat Thru-Hull Connector, 3/4 inch Steel Straight Thru Drain Fittings with Barb, Marine Transom Drain Tube Pipe Nut Accessories
  • GREAT MATERIAL:Hose thru fitting drain tube is made of 316 stainless steel which is durable, not easy to break and has long service life.
  • SIZE: The length of stainless steel straight-through hull is 66mm/2.59inch, the outside diameter is 19.05mm/3/4inch.
  • COMPATIBILITY: This thru drain boat hose is highly reliable and is widely used in ships, yachts, Boats. Meeting your daily needs.
  • EASY TO INSTALLATION:The size of steel drain hull tube is relatively versatile, so it fits in some corners and narrow areas.
  • THE BEST AFTER-SALES GUARNTEE SERVICE: When you receive thru fitting hose, the size is not suitable or too small, or the product is damaged; please contact us in time, we will give you a refund or resend. We are here for support and advice.
No. 11
SEAFLO Thru Hull Fitting Through Hull (1.25" 1-1/4", 01-Pack)
  • H - 97mm, D - 67.5mm
  • D1 = 33mm, d - 41mm
  • d1 - 32mm
  • di - 24mm
SaleNo. 12
T. H. Marine 3/4 Inch Straight Thru-Hull Fittings Boat Fittings - Extended 4.5" (Black)
  • Made of the highest quality virgin material to ensure consistent size and extra durability
  • All materials are UV stabilized to provide longevity
  • T-H Marine has worked with major hose manufacturers to guarantee that our hose barbs have the exact specifications to fit hose securely so that your installations will be trouble free
No. 13
EEYAD 316 Stainless Steel Boat Thru-Hull Fitting Drain for 3/4" I.D. Hose
  • Stainless steel thru-hull with straight barb for hose
  • A good choice for scuppers, sink drains and bilge overboard drains
  • Excellent seawater corrosion-resistant, and heavy-duty
  • Easy to install
No. 14
Keenso 1" Boat Plumbing Fittings,316 Stainless Steel Durable Barbed Thru Hull Threaded Fitting for Boats, Yachts, Marine
  • HIGH-QUALITY MATERIAL: This boat threaded fitting is made of heavy-duty 316 stainless steel material, which is sturdy and durable. It is not easily damaged and corroded, which has qualified quality and high strength.
  • EXQUISITE WORKMANSHIP: It adopts exquisite processing technology, surface with mirror polishing finish, which has strong corrosion resistance in salt water environment and can be used for a long time.
  • EASY TO USE: With a wrench flats on the notched surface, it is easy to tighten and can provide you with a convenient and practical using experience.
  • SCOPE OF APPLICATION: It has high practicability and reliability, its barbed tail ends can provide plenty of room to hold multiple clamps, which can be widely used in boats, yachts, marine application.
  • GUARANTEE: Our product have 180 days warranty, if you have any question about this product, please feel free to contact us, we will try our best to help you solve your problem.
No. 15
SHENGHUISS Boat Thru Hull Fittings Hose Valve Fitting Marine Stainless Steel 316 with Nut&Custom Gasket or Nut Plumbing Thru Drain Connector for Boats, Yachts, RSV for Boat、RSV 1/2 inch
  • Overall Length:2.45 inch(62.3 mm), Outside flange diameter: 1.54 inch(39mm), inner diameter : 1/2'', Thread Size: 0.8 inch(20.4mm) ,
  • Material: Marine grade Stainless Steel 316, Surface: Mirror polished/High polish finish.Ultimate Corrosion Resistant.Suitable for marine boat,yacht,kayak etc, a good damage part replacement choice;
  • The Straight Thru-Hull fits 1/2" inner diameter marine valves or pipe. Includes 316 stainless steel mounting nuts and rubber gasket,installs easy.
  • Threaded:1/2" NPT Threaded Standard American.Boat Thru-Hull Fitting can be used with standard American threaded fitting and standard American valves;
  • Underside of flange has a groove cut in it to trap a bead of silicone between it and the mounting surface. Flange head is very evenly polished. Nut mates with threads exactly; hardness of metal is excellent. Two slightly protruding pins within the interior of the drain allow for a wide blade flat screwdriver to be inserted and prevents the flange portio from turning when nut is installed.
No. 16
Psytfei Thru Hull Fitting 2in Thru Hull Connector Fitting Straight Thru Drain Connector Boating Plumbing Fitting for Onboard Plumbing System
  • Versatile Use: Perfect for scupper, sink drain, and bilge pump overboard discharge, our thru hull fitting can play a role in many places, such as boats, yachts, sails, RVs, trucks and so on; They can be applied for a variety of purposes so that you can enjoy the convenience of life
  • Durable and Reliable: Made from rugged and impact-resistant ABS material, fine workmanship, featuring smooth and flat surfaces, not easy to break or deform, our 2in thru hull fitting ensures safe and reliable operation of your boat's plumbing system for years to come.
  • Detailed size: these white straight thru-hull fittings measure approx. Approx. 2in/5.1cm, compact in size and light in weight, making it easy for you to operate
  • Professional Quality: Our thru hull fitting is highly compatible with the original standard, ensuring simple and dependable operation. Plus, its sleek white design adds a professional touch to your boat's plumbing system.
  • Easy to Install: No complicated tools required - our thru hull fitting is easy to install and remove, saving you time and effort. Plus, our straightforward instructions make installation a breeze.
No. 17
316 Stainless Steel Full Thread Boat Thru Hull Fitting Hose Barb with Nut,Marine Hardware Accessories for Boats Drain Pipe Yacht Bilge Boat Plumbing Fittings (Type: Full Thread,Horse ID Size:3/4")
  • -High Quality: Heavy duty 316 grade stainless steel construction ensures its strength and durability.

  • -Scope of Application: High reliability, widely used in boats, yachts, marine, cars,trailer, etc.

  • -Good Performance: Surface with mirror polishing finish, strong corrosion resistance in the saltwater environment.

  • -Installation: A compact size allowing installation near corners and in confined areas.

  • Package Included:

    1 x Boat Full Thread Thru Hull Fitting

    1x Rubber gasket of matching size

No. 18
SEAFLO Thru Hull Fittings (3/4")
  • 4-Year Warranty!!
  • Color: White
  • For 3/4" Hose
  • DIMENSIONS: H - 80mm, D - 50.5mm, D1 - 19mm
  • DIMENSIONS: d - 27mm, d1 - 19mm, di - 11.5mm
No. 19
NRC&XRC Marine Stainless Steel Barbed Short Straight 1/2" I.D. Thru-Hull with Nut& Custom Gasket for Boat,RSV
  • Material: Marine Grade 316 Stainless Steel Solid metal slab, Heavy Duty ,very strong, durable
  • Customized gasket is more convenient to install
  • Flange O.D:1.54"(39mm);Thread Length:Approx: 31.7MM/(1-1/4'')
  • O.D Size:1/2"
  • Thread O.D:Approx 0.63in. Max. Hull Thickness: 5/8" The detail size refer to the left picture
SaleNo. 20
POCREATION Boat Plumbing Fittings, Boat Through Hull Connector 3/4in ABS Plastic Hose Coupling Drain Outlet Accessory(Black)
  • Superior Plastic: Made of premium ABS material, sturdy, impact resistant and durable, not easy to damage.
  • Easy Installation: Simple to install and remove, no complicated tools required, convenient to use.
  • Significant Accessory: A vital connection in safe and reliable operation of onboard plumbing systems.
  • Perfect Fit: In strict accordance with the original standard, direct replacement for the old or broken one.
  • High Performance: Provide trouble hose connections, convenient to operate, reliable to use.

How to choose a good boating plumbing fittings

Does the idea of finding a fantastic boating plumbing fittings make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in boating plumbing fittings. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top boating plumbing fittings products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top boating plumbing fittings on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top boating plumbing fittings brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top boating plumbing fittings based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the boating plumbing fittings were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good boating plumbing fittings, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your boating plumbing fittings.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting boating plumbing fittings for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our boating plumbing fittings. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what boating plumbing fittings should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on boating plumbing fittings.