Not that familiar with your boat, but our aft shower drains into a sump, which has a sump pump for overboard discharge above the waterline. Yours may drain overboard without the need of a pump. Can you follow the drain hose? What happens when you pour water down the shower drain? It may drain out through a seacock below the waterline.Before I start tearing things apart I need information about the location of the original shower drain pump. My boat is a 1982 33 Chirubinni Hunter.
Not possible. The shower sump will be BELOW the boat's waterline. It connected to a seacock also below the waterline would flow backwards and sink the boat.Yours may drain overboard without the need of a pump. Can you follow the drain hose? What happens when you pour water down the shower drain? It may drain out through a seacock below the waterline.