Replacement Valve Disk For Huma-Air Regulators 4MM Although our regulator is build with only high quality materials, a valve disk can wear during time. This set contains of 1 pc replacement valve disks for you regulator. The black markings on the valve disk are only intended for you to see what side touches the set screw. If a regulator suffers from creep then 9 out of 10 you need to flip the valve disk over. Available in three dimensions 4 mm (Gen1, Gen2, Gen3 regulators for FX and Raw)
