|My thanks,I spent yesterday going through every post on the Forum, and found the discussion you refer to. (I had looked before posting, but, as is often with 'Searches' I didn't use the right 'key' words.) The boat that I am looking at appears to have the small drain hose to the sump but poking with a screw driver suggests that it is blocked. Poking with an old wire halyard that I use to clean my house drains will hopefully be successful.
North Vancouver, BC