For a 1985 Beneteau sail boat (made in France) I would guess that the manual bilge pump might have been from:
HENDERSON Model "MK5" bilge pump – now WHALE (Northern Ireland headquarters)
or
PLASTIMO bilge pump (French headquarters)
Both have rebuild pump kits available - once you can identify the brand and model installed in your boat. Pics will help to identify the manufacturer & model.
Doug in Lakeview
1984 Beneteau First 38 – Hull #178
Belmont Harbor – Chicago