Quote:
Originally Posted by banditpowdercoat
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.
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found with my 2" Dursos running between 500 and 1000gph, hole size in each is only around 1/8"