I am replacing the seals on the hand pump. Could be cheaper if anyone else needs a replacement.
Mine has 0.75" piston with a lip seal at the top and a PTFE ring and "o" ring seal.
Contact me if you need a set. Can arrange fitment on the boat if you need but I will do my own as it not difficult andeasier than removing the pump.
Peterh
07764170439
:)