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 constructionNPT threadsNot suitable for use with diesel fuel or gasolineMaximum recommended temperature = 176 FSpecifications: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.