Keeney VNTKTPTRPPVC Air Admittance Kit, White Ideal for kitchen islands and new vanity installations For Plumbing Ventilation Allows venting when connection to existing vent is restricted Schedule 20 design, connects to 1 1/2" Schedule 40 Includes Studor Redi-Vent: Redi-Vent opens to admit fresh air when fixture discharges and then seals to prevent the escape of foul air Includes 45 degree elbow for offset applications Allows for venting when access to the main stack is difficult.