Lee supplies check valves in a variety of sizes and in forward or reverse flow, and with zero leak, low cracking pressure, no valve noise or wear and screens. Lee Lo-Lohm Cheks are poppet-style, high flow-gain styles with the lowest Lohm rate, in sizes of 0.187, 0.250, 0.375 and 0.500 inch diameters, and in both forward and reverse flow directions. Lee Hi-Q Chek types are compatible with valve cartridges between 1/2 and 1 inch in diameter and also feature a unique cage and poppet assembly.

O'Keefe Control Co. produces ball-type check valves suitable for use with liquids or gases. Products are available in three sizes: 10-32, 1/8" NPT and 1/4" NPT.