13 Best Boat Plumbing Fittings

List Updated January 2021

Bestselling Boat Plumbing Fittings in 2021


Shoreline Marine Plumbing Kit 3/4" X 5' Hose

Shoreline Marine Plumbing Kit 3/4
BESTSELLER NO. 1 in 2021
  • Great For Replacing Or Installing Bilge Plumbing
  • Includes 5' Hose, Thru-Hull Fitting, And SS Hose Clamps
  • 5' X 3/4" Hose
  • Good For Salt Or Fresh Water

Seachoice Stainless Steel Covered Thru Hulls 3/4" Hose: #SCP 18441

Seachoice Stainless Steel Covered Thru Hulls 3/4
BESTSELLER NO. 2 in 2021
  • THRU HULL W/
  • SEACHOICE
  • 18441

Boat Plumbing Fittings - Deck Floor Drain Grate- 2" inch - Marine 316 Stainless Steel

Boat Plumbing Fittings - Deck Floor Drain Grate- 2
BESTSELLER NO. 3 in 2021
  • Cast 316 marine grade stainless steel.
  • Maximum corrosion resistance and durability in the saltwater environment.
  • Polished to a beautiful, mirror-like finish.
  • Concave face plate - 3 1/8" diameter.
  • For 2" I.D. hose. See additional details in description below.

SeaLux Marine 316 Stainless Steel Trim Cover 90 Degrees Elbow Bilge Pump Thru-Hull/Scupper Drain for Hose dia. 3/4", Flange dia. 1-7/8"

SeaLux Marine 316 Stainless Steel Trim Cover 90 Degrees Elbow Bilge Pump Thru-Hull/Scupper Drain for Hose dia. 3/4
BESTSELLER NO. 4 in 2021
  • SeaLux Marine 90 degree elbow Thru Hull / Scupper with 316 Stainless Steel Trim Cover
  • with Highly Mirror polished 316 SS Trim Cover, provide the upscale look of stainless and protects the flange from sun and salt
  • Molded from polypropylene with fiber glass for strength and melted with the Trim Cover
  • Not recommended for use below the waterline.

MonkeyJack Marine Boat Thru Hull Fitting Connector/Drain 3/4 inch~1-1/2" Threaded Hose Barb - 1 inch

MonkeyJack Marine Boat Thru Hull Fitting Connector/Drain 3/4 inch~1-1/2
BESTSELLER NO. 5 in 2021
  • Our Thru-Hulls are meant for installation through the transom and are good for overflow use in livewell installations or as an exhaust port for a bilge pump.
  • Their construction is designed to resist degradation as a result of chemical and saltwater exposure.
  • Molded plastic construction with broad flange
  • Provides trouble-free hose connections
  • Meets ABYC safety standards for small boats

Boat Plumbing Fittings -Thru Hull/Drain - 1" Threaded - Marine 316 Stainless Steel

Boat Plumbing Fittings -Thru Hull/Drain - 1
BESTSELLER NO. 6 in 2021
  • Cast 316 marine grade stainless steel.
  • Maximum corrosion resistance and durability in the saltwater environment.
  • Polished to a beautiful, mirror-like finish - Head only.
  • Size: 1"
  • See additional specifications in product description below.

Boat Plumbing Fittings -Thru Hull Intake Scoop Strainer - 3/4" - Marine 316 Stainless Steel

Boat Plumbing Fittings -Thru Hull Intake Scoop Strainer - 3/4
BESTSELLER NO. 7 in 2021
  • Cast 316 marine grade stainless steel.
  • Maximum corrosion resistance and durability in the saltwater environment.
  • Electro polished satin finish.
  • Size: 3/4" inch thread.
  • See additional detais in product description below.

Winterize Sprinkler Systems And Outdoor Faucets: Air Compressor Quick-Connect Plug To Female Garden Faucet Blow Out Adapter Fitting (Solid Lead-Free Brass)

Winterize Sprinkler Systems And Outdoor Faucets: Air Compressor Quick-Connect Plug To Female Garden Faucet Blow Out Adapter Fitting (Solid Lead-Free Brass)
BESTSELLER NO. 8 in 2021
  • Blow out plug adapter fitting to easily winterize underground irrigation sprinkler systems, outdoor pipes, water lines, homes, cabins, faucets, spigots, garden hoses, sillcocks, and hose bibbs by blow out method.
  • Its short and stubby design allows access to tight spaces. Quick-connect attaches to air compressor. Compatible with standard garden hose threading and air compressor quick-connect commonly found in North America.
  • For your health and safety, this sprinkler winterizer is made of lead-free brass which contains less than 0.25% lead. Lead-free brass costs about 30% more to manufacture than regular brass but we have decided to absorb the additional cost and maintain the same retail price in order to promote the health and safety of our customers. Lead-free brass is also harder, stronger, and more durable than regular leaded brass. Always wear safety goggles when handling or using compressed air.
  • Easily connects to air compressor and garden faucet to winterize lawn sprinkler systems, drip irrigation system, soaker hoses, faucets, and plumbing to prevent damage due to freezing. Compatible with standard garden hose threading and air compressor quick-connect commonly found in North America
  • This heavy duty winterization tool is machined from a solid lead-free brass casting. If you are looking for a quality tool that lasts a lifetime, this one is for you! This blowout plug may also be used to winterize recreational RV, boat, watercraft, motorhome, camper, travel trailer, waterline, piping, and various plumbing where applicable.

Rescue Tape RT1000201205USCO

Rescue Tape RT1000201205USCO
BESTSELLER NO. 9 in 2021
  • Rescue Tape RT1000201205USCO
  • MILITARY DAMAGE BATTLE KIT: We are proud to say that Rescue tape is the only Silicon tape that is used by U.S.A military in their Recovery and Battle Damage Assessment & Repair Kit (BDAR KIT). Made in U.S.A.

MonkeyJack 2 Pieces 1" &1-1/2" Thru-Hull Bilge Pump And Aerator Hose Fitting For Boats Yacht

MonkeyJack 2 Pieces 1
BESTSELLER NO. 10 in 2021
  • Our Thru-Hulls are meant for installation through the transom and are good for overflow use in livewell installations or as an exhaust port for a bilge pump.
  • Their construction is designed to resist degradation as a result of chemical and saltwater exposure.
  • Molded plastic construction with broad flange
  • Provides trouble-free hose connections
  • Meets ABYC safety standards for small boats

Shoreline Marine Thru-Hull Fitting (3/4-Inch)

Shoreline Marine Thru-Hull Fitting (3/4-Inch)
BESTSELLER NO. 11 in 2021
  • Durable plastic for impact resistance.

T-H Marine Supply Thru Hull Fitting, 90' Deg, 1 TH1290T

T-H Marine Supply Thru Hull Fitting, 90' Deg, 1 TH1290T
BESTSELLER NO. 12 in 2021
  • T-H Marine Supply
  • TH1290T

Moeller Boat Transom Drain Tube with Pipe Plug

Moeller Boat Transom Drain Tube with Pipe Plug
BESTSELLER NO. 13 in 2021
  • MOELLER 02030310, MOE02030310

Tips on Repairing Your Plumbing

This is an article describing the process of replacing existing plumbing with plastic fittings and pipes.

Water is one of the few substances know to man that will actually expand as it freezes. Everything else we know about will contract. Anyway, I had a load of repairs to take care of. The first thing was to locate the areas of pipe that had broken and then go about getting them fixed. I was unfortunate here because the pipes were a mix of differing materials. I could see galvanized pipes mated to plastic. And I found rigid plastic pipe mated to the old style black flexible pipe. Turning the main water on I soon found numerous breaks and set about repairing the damage.

Galvanized pipe is rarely used anymore and I managed to talk the home owner into letting me replace all of the steel and flexible black plastic pipe with rigid plastic. It is inexpensive, goes in quickly and there is no need to thread the ends or carry around heavy connectors or unions and such. Rather than enter the house and run plastic to each and every sink in there, I just sawed off the steel pipe where it went to the water heater, and again where it left the heater and went from there.

I ran a line from the output of the water heater all the way to the bathroom sink and bath tub and then teed off from there and continued the line up to the kitchen sink. I had to place another tee and run a line for the washer while I was there as well. Continuing from that point I laid a line up to the remaining bathroom sink and tub on the other side of the house. At each stop and tee, it was also required that I use a hack saw to cut away the old plumbing and use the appropriate connectors to attach the new plumbing to the old plumbing fixtures where they projected into the crawl space.

That completed the hot water side of things and I returned to the main water valve and ran a line to the input side of the water heater and placing a tee there as well, I continued running a line to the cold water side of all the sinks,bathtubs, toilets and the washer.

Using plastic water pipe is the best thing to happen to plumbers since the invention of the self propelled shovel. Plastic by it's very nature is perfectly suited to plumbing. Plastic can be produced cheaply, in great numbers and in any size needed. To assemble it, all you need is a hack saw to cut it to the proper length and a can of glue. The glue is a specialized type suited for the type of plastic you are using. Just take the swab from the can and liberally coat the outer surface of the pipe about a half inch from the end. Apply the swab again to the connector..only to the inside of it this time as the connector will be sliding over the pipe. Place the swab back into the can and the push the two pieces of plumbing together, and give it a twist. A half rotation is plenty, and leave it alone. The glue melts the plastic you see, and them the glue quickly dries again. So what you have here is essentially a weld. A chemically produced weld. The plastic parts have been joined together is a seamless bond. That pipe is good to carry water within ten minutes.

I also like to use what is called a primer/cleaner on the parts before I glue them together. This comes in another can and serves to chemically remove any traces of oil, grease or other contaminates that might otherwise inhibit the glue from melting the plastic and/or preventing the glue from drying quickly or completely.

I made another trip under the house and this time taking with me some wire hangers to place under the newly installed plumbing to support it and the weight of the water that would soon be filling them. I also advised the homeowner that installing some foam insulating sleeves over the pipes would be a good idea and also installing heat tape over certain exposed areas.

Back at the main water valve I slowly opened it and allowed the inrush of water to completely fill the pipes and stayed there and listened to determine when the sound of rushing water stopped. The toilet tanks all had fill and then once the pressure equalized, I could go and look for leaks. I didn't expect any nor did I find any. By using plastic pipe for the this I had saved the home owner a lot of money. Plastic is far cheaper than steel to produce and faster to put in. I didnt have to stop and use a threading tool or use a pipe wrench at each and every connection either. He saved money on parts and labor.

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