MIFAB Cleanout top assembly with 4″ machined N.P.S.M. threads. Available in 5″ diameter and in either medium duty nickel bronze (2,000 - 4,999 lbs.), or in heavy duty Type 304 stainless steel (5,000 - 7,499 lbs.) and / or “Special Duty" (over 10,000 lbs.) ductile iron. Furnished standard with vandal resistant allen key screws.