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Sectorsteve said..This one of mine that came with my boat looks very good. All plastic. Uscg approved made it northern ireland. Installing it tomorrow for easy use. Thanks for the tips people.
That is a Henderson Pump. If you have one of these, the spares you need to carry are the inlet and outlet valves which from memory are reversible and the diaphragm.
If you do not have a spare diaphragm you may get away with a piece of thin neoprene or inflatable boat material with holes punched to fit. However that will result in a severely limited stroke of the pump but still work.
This is what is described as a "positive displacement pump" which is why it does not need priming.
The Henderson pump is what is supplied with "La Vac Marine Head" whereby the sealing lip of the head seat and lid close the suction line of the pump.
So, therefore this pump could serve the dual purpose if fitted with a Y cock on it's suction side of being a head pump and a bilge pump.
A bit of a weight saving for you and ensures the pump gets regular use.
Tinkabowtit.