... of check valve NOItemParameterSpecificationRemark1Air flow≥6L/min2Air flow leakage≤0.1L/min3Air leakage≤0-pa Without any leakage4Anti air pressure≥30kpa56III ... Test instrument: 1,10L/min air flow instrument, 1 set2,Air pump(10L/min), 1pcs3,5 L water bottle with ... result air or water leakage. 2, Make sure the check valve not cracked during shipment to keep from broken when shipping ...