Peggy, I am about to install a macerator so I can pumpout off shore in the Atlantic. I'm debating putting a Y valve in the existing outlet line to the deck or putting in a new outlet with an ordinary valve in the tank using one of those UNISEALs. Which method would you recommend? Also if I went with the new outlet, if I installed it in the top of the tank with a pipe inside going to near the bottom of the tank, would it be as affective as an outlet in the side near the bottom? Thanks Paul