I am considering fitting non return valves to both my cockpit scuppers as on occasions in rough conditions I am getting water flowing back into the cockpit. The cockpit is deep, and about one foot above the water line. A life -raft is fitted in a cockpit :unsure: locker, so I could get salt water flowing around the bottom.

Any reasons NOT to fit this?

Hi Dick, thanks for the feedback. The water ingress comes from exactly the same sources and frequency you describe. It is not a big problem just a bit alarming when it happens, at my age you think at the time, could be loss of bladder control!

The diameter of the pipe work from the cockpit to the sea-cock is 2 inch so quiet large. The length of the pipework is approximately 18 inches and they run pretty straight down, no cross over. We don 't have dirt traps on them in the cockpit. Water runs out very quickly.

The liferaft locker lid hinges opens at the cockpit floor so not much I can do about that. The life raft is in a valise so should have some protection from water ingress. Another design fault is that the engine controls are at ankle height so any water flowing around the floor could get into that, which is a concern. So the judgement is, am I more likely to get pooped than flooded via the cockpit drains.