OSB ID357 Cast Iron Island Tub Drain Testable Rough-in for Freestanding Bath TubsDescription Install a Freestanding bath tub in minutes with the Island Tub Drain. No muss. No fuss. No kidding. Asymmetric design 18 Gauge Epoxy coated Metal Deck Plate with holes to lock to Thinset Snap off Test Cap Mortar Tile Guard included ID357 features a Cast Iron Body ID357 is a Freestanding Tub rough in (install before tile installation) Designed to be installed in an 8 10 joist space with 1 1 2 2 P Trap respectively Supplied with Brass