The 6 Best transom scupper valves (2023 reviews)

Attwood offers a variety of valve for personal choice and yet maintaining quality in all the variants. The kit comes with a new plastic ring, rubber flap, rubber backing gasket ring, and four stainless screws. It is designed to be mounted over existing thru-hull fittings up to 2 inch. The rear one raises off the hull surface slightly to clear the thru hull fitting. It does not fully close, therefore while drifting or without propulsion the water comes in.

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 also comes with a new plastic ring, rubber flap, rubber backing gasket ring, and four stainless screws. It is easy to install with all hardware included.

Why We Like This:

Is designed to be mounted over thru the hull fittings up to
Good investment for long term

invincible Marine transom scupper valve

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Invincible Marine makes beautiful and great valve with classic and smartly choosen materials. It is proud to serve the parts and accessory needs of the marine industry. It is the outer flange (white) that is 2-7/. This is installed slightly above the deck floor to allow water that comes over the sides to exit the deck. The holes match perfectly with the original ones, and works just as good.

Why We Like This:

Very easy to install and work finel
Fits perfect, just don't over tighten the screws
One of the new comers and featured product

Unknown transom scupper valve

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Attwood's scupper valve mounts on the transom slightly above the water line to provide a water exit for boats with self-bailing cockpits. It opens outward to allow water out of the boat when necessary but seals back to prevent water from entering. It can be used as a replacement valve for the 3881 thru-transom scupper.

It's designed for installation above the water line only. The Attwood scupper is a combination of plastic and rubber washers with a flap designed to act as a valve for water exit out of your boat.

Why We Like This:

Delivers what they promise
One of the new comers and featured product

Hlyjoon transom scupper valve

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For a low asking price, hlyjoon transom scupper valve has managed to overwhelm their customers by packing as many features as they could. It is an important accessory for stern plates, fish wells, freezers, yachts, etc. It can be installed on the beam above the waterline, or used as a drainage device for the engine room through the hull. The marine sewage valve is made of high-quality nylon material, and the nut of the stable structure can drain water. It has good corrosion proof, high hardness, not easy to deform and damage, and durable. It is simple and can be completed in a few minutes. Each process of the products is carried out in accordance with the standards, and the design is improved to increase durability.

Why We Like This:

Equipped with a seal to prevent water leakage, the cap can be tightened easily
Great accessories for boat transoms, fish wells, ice chests, yacht and more
Good brand reputation

Akozon transom scupper valve

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The akozon transom scupper valve is satisfactory and appropriate and fits well with your daily usage. It is an excellent accessory for boat transoms, fish wells, ice chests, yachts, etc. It can be installed on the transom above the waterline, or as a cabin drain through the hull. It is used to stop water penetration and drain the water from the inner hull of the ship, allowing water to flow out but not enter.

The marine drain valve is made of high-quality nylon material, and the nut with a stable structure can drain water and is strong and durable. It is equipped with a seal to prevent water leakage, and the cap can be easily tightened, which is lightweight and easy to use.

Why We Like This: