Studor 20395 Trap-Vent, Integrated Trap and Air Admittance Valve, 1-1/4" Outlet, White Easy installation in minutes and Replaces conventional lavatory P-trap Trap-Vent is for use in a bathroom lavatory installation venting up to 6 DFU Maintains required 2" trap seal while one-way valve allows air into the drainage system Provides a modern and clean appearance and greater freedom of design Ideal for remodels, restorations and floating sinks