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031-0075 CHECK VALVE 1/2" - 14 NPT X 3/8 SANBORN MITM PARTS DIAGRAM FOR GENERAC GN031 0075 CHECK VALVE 1 2" 14 NPT X 3 8 SANBORN Check valve failure is caused by issues like debris contamination, wear and tear, improper installation (wrong direction sizing), water hammer, material incompatibility (corrosion), and operating outside design limits (high temp pressure). These factors lead to the valve not sealing, sticking open, or vibrating excessively, causing leaks, backflow, or blockage.