I have the standard rubber flap that many use. Scuppers are to close to water line to be safe when left in the water. Feel my boat is closer to self sinking then self bailing. Use the scupper plugs and going to install a floor drain to get water to bilge pump when scuppers are plugged. Will plug floor drain when fishing or cleaning boat to keep dirt out of the bildge and drain dirty water out scuppers. Anyway I am thinking of getting the TEMPO AUTOMATIC DRAIN PLUGS http://www.shop.com/op/~AUTOMATIC_DRAIN_PLUG-prod-12448365 Not sure if iboats sells them. I saw these on a boat and like the idea. I think it would work better then the flapper or ping pong ball scupper valve. If anyone is using these please review them for us. Thanks Edited After looking closer at these I think they are for drain plugs not the larger holes of scuppers.