Sioux Chief 873 series cleanout cover kit shall be used where necessary in drainage systems. Kit shall include a 20 gauge, stainless steel cleanout cover, which shall fasten via a 2 -1/4 in stainless steel bolt with 1/4-20 threads to a cast brass MIP plug with countersunk square head. Plug shall be tapped to accept bolt. Kits shall be available for large, medium or small applications.