I have been seeing a lot of posts in my search for wet arse and special scupper plugs. I have been doing extensive searches on solutions for this I bought the gray with green inserts only to find they didn't fit
but finally I found these. http://www.h2okayaks.com/engine/shop/product/52851/Pair+Medium+Kayak+Gear+Self+Draining+Scupper
I will purchase some next week and then post my findings. hope this helps some others out there
Good work finding these Ryderfzr. I am interested as to how you have gone with testing them?
I have done quite a bit of experimentation with modifying the Hobie skupper plugs and with making my own. The best valves seem to be the ones that I got from a SCUBA diving regulator exhaust valve or a snorkel drain valve as these allow water out with verry little resistance. These ones you have found look to use the same type of silicone valve so should work well.
Which size (diameter) did you end up getting?
I also agree that raising the seat is a good idea but I think a combination of both is the best solution.