Wide mouth opening for drainage of auxiliary line. Drain line partition for separation of washer discharge hose and auxiliary discharge line. Discharge guide tube holds discharge line firmly and protects against splashes. One drain outlet, no additional fittings. One-piece molded in test cap will not fall down drain line. Four mounting brackets included. Rough opening: 10 ¼" W x 6" H x 3 5/8" D. Faceplate dimension: 13" W x 5 5/8" H. Faceplate unassembled.