ANSUL Foam Hardware ( Line Proportioner, Brass, PL-550 (550 gpm), 3% Conc. Orifice ) Part Number : 71528 Material : Line Proportioner, Brass, PL-550 (550 gpm), 3% Conc. Orifice Thread Size/Type: ………….. Weight (lbs): 30 Part Description: …………..