Plumbing vents (a network of pipes that carry ... to ensure the vent can never be flooded. The other uses a mechanical vent known variously as an air admittance valve (AAV), Studor valve or ...

It is ideal for all types of DWV (drain-waste-vent) systems ... ways to connect your plastic plumbing system pieces together are by solvent welding or mechanical couplings. Solvent welding ...