MIFAB® Series FC strainer with 4″ machined N.P.S.M. threads with surface membrane clamp available in either 7″ or 9″ diameter sizes and in either light duty nickel bronze (under 2,000 lbs.) or in heavy duty Type 304 stainless steel (5,000 – 7,499 lbs.). Furnished standard with vandal resistant allen key screws.