I am in the process of installing a bubble tub that holds 55 gallons. All the pvc pipe is 2" including the p-trap. When draining, the tub gurgles from the fill line untill the last drop drains out. The drain runs 12'-0" horizonally and is pitched 1 1/2 " overall. I have moved the 2" vent from 2" ,18" and 60" from the p- trap withe the same result. I need to fix this before I drywall . Any suggestions?
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Bath gurgles through overflow