Oatey | sku: 202329477 Oatey 3 In. - 4 In. Mushroom Vent Pipe Cap The Mushroom Vent Cap is made of high-impact PVC and requires no assembly. It uses 3 hex-head bolts for ease of installation. Ships fully assembled and includes 3 hex-head bolts. It prevents debris, water and various critters from entering the vent pipe... Log in for pricing