MIFAB® Series MI-DU trap seal primer distribution unit with four brass compression outlet connections (specify -500 for 1/2 in or -625 for 5/8 in) ABS body and HDPE lid with top 1/2 in MIP. connection, four 1/4 in diameter vent holes in the flange and three 1/8 in diameter Phillips head screws to secure the lid to the body. Unit complete with four wall internal body design that aligns with the slots in the underside of the lid to distribute water evenly and to only the desired number of ports.