Holding Tank Auto Fill?

[Russ Smith]

Hi EveryoneI have a 79 model Catalina 30....I'm very happy with it, generally.The boat is equipped with a head that is connected to plumbing that includes two Y valves. The valve closest to the head, that selects between waste moving toward the holding tank and from the holding tank to the pump out port. froze and I changed it...a difficult task.But, my problem, I notice that the holding tank fills with sea water in a very short time....about an hour, after being pumped out. I'm assuming that the sea water in leaking through the Y valve that selects between dumping the head overboard or to the holding tank. There is a sea cock on the overboard waste line, which I've closed, but have not been back to the boat to see wheather the holding tank is still empty.So, my question, is it normal for this Y valve to allow sea water to leak in to the blader type holding tank with the sea cock open.....or is it a normal procedure to keep the sea cock closed except when it is being used? Do I need to change the Y valve nearest the holding tank?Russ

 

[Tom Soko]

another thru-hull?

Russ,You probably have another 3/4" thru-hull that is connected to the output of the mascerator, and water is backing up thru it into the holding tank. I would suggest that all thru-hulls having to do with the head be closed unless you are using them, especially the 1.5" head discharge and 3/4" mascerator discharge. good luck.Tom Soko. s/v Julandra .