I had a 91 Trophy 20' and have a 93 2502. The TH max flows dont work as good as the Rabuds. Water will push the ping pong balls out of the way when there are people of to one corner of the boat. You can identify them from a small Phillips screw in the back that you unscrew, twist it and pull it off of the underpiece. The Rabud just has the 4 screws with a thick silicone underpiece. It works great with keeping the water out. Its the one to use. I have seen the rabuds listed as Seachoice too. But there is writing on the housing that says rabud. I put twin 4 strokes on my 2502 making the scuppers under water while sitting. The Rabuds are the only ones that worked. It's a problem with these boats. The rubber flaps don't work. They will let in enough water to fill your fishboxes making the butt sit even lower while fishing. They are not the big ones but the smaller ones with 4 screws, not the large with 6 screws. Crap just gets in and plugs them from time to time. Leaves, pine needles, etc. So I started carrying a really big zip tie. About half inch wide and 1.5 to 2 feet long and push it in and out of the scupper tube to work the debris out. If you use a stiff wire you might puncture the connector hose. The big zip tie worked best for me.