Thanks for the replys
Got myself into another Seacraft Rabbit hole - Looking around the internet I came up with 4 back flow check scuppers alternative's to the Timco flapper scuppers I have now, which have never worked well, even with new flappers.
1 - HT Marine Flow-Max Ball Scuppers FMS -1-0-DP.
2 - Rabud scupper ball valve, similar to the HT flow max.
3 - HT Marine Overboard duckbill Scupper.
4 - Gemlix thru hull duckbill scupper.
I like the look of number 3 - the HT Marine Overboard duckbill scupper, simple, inexpensive, looks easy to maintain.
Any comments about the other choices - I am looking for something that definably works better than the existing flapper valves at stopping water coming in the boat.
Also there is the idea of crisscrossing transom scuppers to the opposite side deck drains - ie connecting port scupper with the stbd deck drain and vica versa. The idea being that weight on one side will raise the scupper on the opposite side. Not sure if that makes sense to me ?
Edit - I see some comments that the HT Marine Flow-Max Ball Scuppers FMS -1-0-DP do not work when the scuppers are under water ? - is that true - my scuppers are always under water.
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