Used in concrete slabs, wood floors, and multi-story flooring to allow access to bath tub plumbing. Provides a quick economical and clean method of installing tub waste and drain. Semi-flexible and very durable. Build-in cutout for up to 2' drain. Enables installer to form a clean cavity in a concrete slab so a trap can be easily connected to the drain system. Forms a clean, waterproof cavity in a concrete slab so a trap can easily connect to a drain system.