--- title: What size pipe opening will fit the 3 in. and 4 in. Adjustable Pipe Flashing with Aluminum Base and Rubber Collar? description: This pipe boot has been tested and is Building Code compliant with standard schedule 40, 4 inch; PVC pipe (4 inch; OD). --- [Skip to content](https://help.gibraltarbuildingproducts.com/en/knowledge/what-size-of-pipe-opening-will-fit-the-3-in.-and-4-in.-adjustable-pipe-flashing-with-aluminum-base-and-rubber-collar#main-content) English Show submenu for translations ![GBAD Full Color.png](https://blog.stealthbond.com/hubfs/GBAD%20Full%20Color.png) Open main navigation Close main navigation - English Show submenu for translations - Go to www.gibraltarbuildingproducts.com Go to www.gibraltarbuildingproducts.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://help.gibraltarbuildingproducts.com/en/knowledge?hsLang=en) 2. 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