Groco PNC Series Check ValveGroco PNC Series Check Valves are made from PN series cast bronze nipples. A check valve is placed inside to prevent back-flow in plumbing systems. The check valve imposes almost zero flow restriction, and requires less than 1/2 PSI to open. Colored bands indicate flow direction (green to red), confirmed by the permanent laminated tag. C83600 cast bronze construction; NPT threads; Not suitable for use with diesel fuel or gasoline; Maximum recommended temperature = 176 F; Specifications:Part NumberThread NPTABPSI to OpenWeightPNC-5001/2"1.77"0.88".450.17 lbs.PNC-7503/4"1.77"1.06".450.21 lbs.PNC-10001"2.34"1.38".450.33 lbs.PNC-12501-1/4"2.51"1.75".450.62 lbs.PNC-15001-1/2"2.49"2.00".450.72 lbs.