Maxline M8201 Dual Port Outlet Kit with 3/4-Inch Tubing and 1/2-Inch NPT Outlet Port Kit includes: Nylon Molded block, M8003 Maxline adapter fitting, drain valve 175 psi maximum working pressure Front of block is ported 1/2-Inch female NPT thread 2x Gray Nylon Material Use only with Maxline 3/4-Inch system