I know this post was from 2015, but just curious, I have a Beneteau
First 285 with a Plastimo bilge pump
and have the same issue, a nice cutout for a discontinued pump.
Any luck with a replacement? I would like to try a Gusher or Urchin, but I am afraid the cutout won't match:
Thinking of trying the Whale Gusher Urchin Manual Bilge
/ Waste Pump:
Whale Gusher Urchin Manual Bilge / Waste Pump
What did you end up doing for your replacement?