Oatey 3 in. or 4 in. Mushroom Vent Cap The Oatey Mushroom Vent Cap is made of high-impact PVC and requires no assembly. It includes 3 hex-head bolts for ease of installation. The fully assembled mushroom vent cap fits 3 in. and 4 in. vent stacks to prevent debris, water and various critters from entering the vent pipe. Oatey products have earned the trust of plumbing professionals for over 100 years. Features Mushroom vent cap fitting 3 or 4 in. vent stacks Fully assembled and includes 3 hex-bolts Made of high-impact PVC construction Prevents debris, water and critters from entering the vent pipe, while still allowing the proper air flow through For DWV applications USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.