Your vent hose is to large in Diameter. It's not matching the drain size to the cap hole, but matching the cap hole to the flow requirements. I have 6 0.018" holes in my cap for venting, about 300GPH drain. and it's silent. Try getting a shutoff on the vent, something you can precicely throttle back untill it's silent.
found with my 2" Dursos running between 500 and 1000gph, hole size in each is only around 1/8"
07-09-2009, 10:35 PM
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