One Way Motorwell Drain Tubes

[Capt Terry]

As I already have the Hermco-built splashwell and am raising my transom 2", I rarely expect to get water over the transom in my SC lake usage. In the past I operated with the drain plug removed which was a problem at rest with heavier guests in the jump seats. With the transom height increase I expect to keep the plug in all the time.

Does anyone know of any reliable one way drain tubes so any over the transom water runs out but none comes it? Got pics or part numbers? Must be something that does not plug easily by small debris, etc. Thx