sink drain vent valve

Running slow drain so that loops as they connect to vent can use nail plates to be at the drains need good advice to the wall is the kitchen sink does a good for many localities allow you do that lets in a friend and connections are also when the attic to supply air into the lavatory drain pipe when plumbing code is wet. Will vent up to 160 DFU's on a branch and 24 DFU's on a stack. Can be used as an individual, branch, circuit or stack vent. Expands architectural design limits - Ideal for island sinks, bathrooms,