The OATEY 39016 is a USA-made 2" 1 1/2" Sure Vent plumbing air admittance valve made of PVC. This two-piece valve is round in shape and measures 4 inches in height, 6 inches in length, and 6 inches in width. It is compatible with Oatey products and is sold individually. Made in China, this air admittance valve is designed to provide proper ventilation in plumbing systems, ensuring smooth operation and efficient drainage.