Peggie Hall wrote:
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.

It doesn't matter whether waste is pushed or pulled through a y-valve.

However, the pump, whether manual or electric, should be after the
y-valve. If it's ahead of the y-valve, it'll interfere with pumpout. A
particularly strong pumpout might be able to pull waste out of the tank
through the pump, but that much suction is likely to damage the pump.

You could eliminate the y-valve altogether by specifying two discharge
fittings in the tank...the hose from one goes directly to the deck
fitting...the hose from the other goes directly to the pump, vented loop
and overboard. That would allow you to connect the macerator directly to
the tank--but I don't recommend it 'cuz it increases the risk of
cracking the female fitting in the tank.
Thanks Peggy,
I guess I will go with the conventional hookup.
krj