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Larry

wrote in news:1170471858.010168.132370
@a34g2000cwb.googlegroups.com:

On Feb 2, 5:06 pm, krj wrote:
Peggy,
I am re-plumbing my holding tank to include a macerator pump, Y-valve,
and through hull. The easiest way to mount the macerator pump is to
screw it into the outlet of the tank then plumb to the y-valve.
Question
is, will the pump out be able to suck through the pump or can I turn
the
pump on while pumping out the tank. Also is there any problem with
pushing stuff through the Y-valve rather than pulling through the
valve.
Thanks
krj

Typically the Y-valve diverts the contents of the head either to the
holding tank or overboard through a thru-hull fitting. You could cut
into the holding tank pumpout hose and install a T and run your
macerator pump off that. That way the pumpout process wouldn't be
sucking waste through the macerator pump. The discharge line on your
macerator pump would then go to your thru-hull fitting thru a looped
hose with a syphon break fitting. The Y valve wouldn't be involved at
all in evacuating the holding tank.

Isn't the Y-valve REQUIRED by the regs to be installed? The common port
on the Y-valve goes to the tank bottom outlet, one port goes to the
pumpout fitting on deck for the vacuum hose to mate with. The other port
on the Y-valve goes to the mascerator pump and out to the ball valved
thru-hull fitting to sea. You're supposed to lock the Y-valve in the
pumpout position while you're in the harbor.

Larry
--
Democracy is when two wolves and a sheep vote on who's for dinner.
Liberty is when the sheep has his own gun.