The Oatey® Bell Trap Drain is designed for use in garage, patio or other outdoor use. The water drains into a well in the drain unit that serves as a trap to contain sewer gas. The strainer snaps onto the drain body. The 1-1/2 x 2 in. Bell Trap Drain fits over 1-1/2 in. or inside of 2 in. Sch. 40 DWV pipe. Oatey products have earned the trust of plumbing professionals for over 100 years.