1 is the head floor sump/bilge pump. Pumps out the head floor area after a shower – the pump is accessed with a handle inside the head itself.
2 is the seawater inlet filter for the engine cooling water
3 is the fuel line filter between the tank and engine
4 is a manual bilge pump
There should be short metal handle in the head for 1 in the head and & 4 under the cockpit locker seat