Sorry but I guess I should have been more clear. What I mean is that there is space for tanks and a hole in the galley next to the sink where a faucet should be.
What I was looking for was whether anyone knew of an aftermarket set-up that might fit my boat. I think a hand pump would be appropriate. I've seen a similar boat with a thru-deck fitting for filling. How about emptying? Would this boat have had an electric pump in the bottom of the grey water holding tank for emptying?