Peggy, I want to install a Whale Gulper on my 331. I was thinking that I could install it in between the tank and the y valve. The Y valve goes to deck pump-out or to a sea-cock for over board discharge. Any problem with putting the gulper in the line that may be pumped out dockside? Do you think I would need to run the pump when its being pumped out dockside or will it be fine "off" Thanks