Another picture for ya...this is part of my 3/4 bath. That is a vanity drain on left and a shower drain on the right (toilet drain not shown in this pic). Above the floor the vanity drain has a dry vent. The shower drain drops about 30" to the trap. I poured a cup of water in the shower pan and I think my neighbor could hear the water dropping into the trap from across the street. This is going to drive me nuts. What should be done here?
The shower needs a vent. Additionally the max drop allowable from the shower drain to the trap is 24" (UPC)
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