In the process of finishing up the install of a bubble tub that holds 55 gallons. The tub gurgles through the overflow tube when filled completely untill the last drop drains out. All the pipe is new 2" PVC. I have tried moving the 2" vent from 2", 18" and 60" from the p-trap with no result. The tub drain runs 12"-0" horizonally with 1 1/2" pitch overall. Can you help, I need to drywall soon? Someone suggested double venting.
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