Scupper hole drain valves.

[tangler]

I have water backing up through my drain tubes sometimes in rough water and heavy seas. I realize that this is due to the deck of the boat going below water line. That is no shock, i as well as all have added hundreds of pounds to the backside of the boat. She is a 21' penn yan HT. I read here about someone adding "ping pong ball" scupper valves, i assume this means when the transom goes deep the balls back into the tubes and provide a better seal than the flappers? I would like to hear some feedback from some who have these "ball valves" and where to purchase them if they are worth the upgrade. Thanks. TANGLER.

[BullGator]

Last year my buddies used a simple transom plug (rubber, with flip over bail) to seal the 3/4" scupper holes on their sportcraft. Similar rubber plugs can be found at plumbing stores for larger sizes.

[tangler]

Yea, did that on an older boat. Not the same setup though. My scupper tubes are close to 1.5'.

[rick c]

Sea scuppers , buy them at West Marine

[BullGator]

No problem getting 1.5" plugs. Fernco is a popular manufacturer, may even find them at Home Depot. Online available at McMaster-Carr, part number 2613K21, $1.59 each. They have about a dozen other styles to choose from also.