The 7 Best Boat one way Drain valves (2023 reviews)

We consider a boat one way drain valve to be a worthy investment in the long run. We are here to help you choose the right one for your purposes from all the best available products in market today.

Our review process: Show/Hide

Our Top Picks:

Best Overall: Buy: Seachoice Boat one way Drain valve READ REVIEW

Best For bilge pump check valve: Buy: Aincix check valve READ REVIEW

Best With Plug: Buy: Seasense one way valve READ REVIEW

Best For Thru Hull Fitting: Buy: Attwood Boat one way Drain valve READ REVIEW

Best little Brass valve: Buy: Seasense Boat one way Drain valve READ REVIEW

Best For Boat Hull: Buy: Aincix Boat one way Drain valve READ REVIEW

Best Budget: Buy: Attwood scupper valve READ REVIEW

Best Overall: Seachoice Boat one way Drain valve

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The seachoice boat one way drain valve is specially designed for your daily purpose and has plenty of most useful features. From anchors to anodes, Seachoice offers a wide range of products designed to make your experience on the water safer and more enjoyable. It is committed to delivering quality marine accessories and oem replacement parts to satisfy fishing, boating and watersports enthusiasts worldwide. It includes fiberglass reinforced retainer ring, rubber flapper and gasket. It is suitable for mounting on transom above waterline or as thru-hull cockpit drain. It is easy to replace all the old scupper flaps. It is manufactured to rigorous standards to ensure proper function and first-rate appearance.

• Efficiently drains water from self bailing cockpits
• Easy to instal, good quality and worth every penny
• Good investment for long term

Best For bilge pump check valve: Aincix check valve

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The aincix check valve is satisfactory and appropriate and fits well with your regular usage. It is perfect as a check valve for a boat shower sump pump. It fits perfectly inside 1 1/8" corrugated bilge drain line, no need for extra fittings. It keeps the kitchen sink drain from backing up into the dishwasher when it gets plugged.

It is designed for a bilge pump check valve so should work with home water pressure. The 3/4 check valve is plastic, and the hose clamps are stainless steel. The design is for the hose instead of pipe. These are nice little check valves. It has a design that is for the hose instead of pipe.

• Tight on large part of body so you can use 3/4" or 1 1/
• Almost no resistance so no change in bilge pump output
• Fits perfectly inside 1 1/8" flexible corrugated bilge exit tubing
• Worked really well to connect the dishwasher output hose to the sink plumbing

Best With Plug: Seasense one way valve

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The seasense one way valve is capable of outshining several other valve featured in this list in overall features in its price range. It is perfect fit for any new transum. The hole you will drill with this new plug is the same or smaller than your existing hole. It is made of a high density plastic. There is also a pin through the tub which keeps the ball from coming out of the mounting flange side. It fits perfectly and works super good. The one way valve in it is quite nice. It will always let water in your boat.

• One way plug is great,easy install great product
• Has a pin and a small ball inside to make one-way
• Delivers what they promise

Best For Thru Hull Fitting: Attwood Boat one way Drain valve

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate valve. The attwood boat one way drain valve is exactly that - it's a simple valve that hits all the right notes. It is designed for under the water line. It works great at sealing and keeping water out. On this type, the flap is thick and doesn't warp very much(and is easily replaceable), it opens fully to drain at max flow, and it seals enough to keep water out. The inside of the scupper is 4" diameter. It does not fully close, therefore while drifting or without propulsion the water comes in. It is easy to install, and they now fit flush. The white material is plastic. It is designed to be mounted over existing thru-hull fittings up to 2 inch diameter.

• Perfect replacement for oem boston whaler scuppers
• New and hot release

Best little Brass valve: Seasense Boat one way Drain valve

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The SeaSense brass shut-off valves are for 1/4" fuel lines that provide a quick and easy way to connect one or more tanks to your motor. These have a 1/4" npt female three-way valve click. It is working quite nicely plus works in mysterious ways. The valve is a plastic drum, so it will no take the pressure. It allows only one position of the handle.

• Three-port diverting valve to regulate flow among three sections of pipe
• Lot of satisfied buyers

Best For Boat Hull: Aincix Boat one way Drain valve

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Best part: aincix boat one way drain valve costs comparatively low and it is available to ship in 24 hours. It is used for bilge pump check valve on boat. The Flapper valve inside, this is a design for marine. It fits perfectly with other pump parts.

• Good investment for long term
• Good brand reputation

Best Budget: Attwood scupper valve

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The attwood scupper valve is capable of outshining several other valve featured in this list in the price department. This hull is so sturdy. It is plastic on a 21' yamaha boat. It has a rubber "flap" that acts as a valve. The end also has a "nut" cast into the body which is helpful for assembly and extremely helpful for disassembly. This will keep you clean.

The threads are 3 or 4 inches so it can be used for a hull that thick. This is generally used above the waterline but the flapper will prevent much back flow. This will work if your hole diameter is 2 inches and your hose is 1 1/2 inches.

• Will last for a long-long time
• Perfect length for thick boston whaler hull
• Must-needed for below water line scuppers
• Feels like great quality, very sturdy and heavy