In this video we walk through the installation of a OATEY SureVent 11/2 in. x 2 in. PVC Air Admittance Valve. The SureVent features a 1way valve that permits air to enter when negative pressures develop in the piping system. The SureVent closes by gravity to seal the vent terminal at zero differential pressure. The SureVent prevents sewer gases from escaping into your home!