Air admittance kit with trap. Ideal for kitchen islands and new vanity installations. Allows venting when connection to existing vent is restricted. Schedule 20 design, connects to 1-1/2 in Schedule 40. Includes Studor Redi-Vent which opens to admit fresh air when fixture discharges and then seals to prevent the escape of foul air. 45 deg elbow for offset applications also included.