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Molar
I cut-off both ends of the check valve where a hose would nomally fit. This shortens the overall length, allowing it to fit neatly into the scupper tube. (Arrow on the check valve must be postioned outward)
Then I enlarged the scupper hole inside the boat, just enough to fit the check valve from the inside the boat. I seal around the edges w/ elastomeric.
When the boat is moving, the water moving pass the scupper creates a vacuum. The check valve opens, allowing water to flow out.
When the boat is seating in the water, the check valve is closed. Water pressure outside the boat tends to close the check valve.
You can test it by blowing into end of the valve before installing it.
When washing the deck at home, I insert a small section of plastic hose into the check valve. This forces the valve open w/o damaging it.
Its the only solution I have found that works fairly well.
I'll post more pics.
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