that is not a bad idea. If you left the seacock to the manual pump's discharge line open by accident and didn't have this ball valve your mechanic is suggesting, you could easily damage the pump's check valves when you pump out the tank. If the vent to the tank was restricted or clogged, this becomes almost guaranteed.
This is the same reason I recommend putting in a diverter valve rather than just a "Y" when setting up a manual pump to dump the holding tank overboard.
Originally Posted by good5buck
One more question, but first some background .....
My tank is configured with two separate dip top-mounted tubes and discharges that lead to (a) a manual Whale diaphragm pump and (b) a deck pumpout fitting.
In this case, my mechanic is pushing me to put a ball valve between the tank and the diaphragm pump to improve suction and protect the manual pump. I haven't seen this approach recommended anywhere else under the sun, although it doesn't strike me as a terrible idea. Thoughts?
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