Whittle & Neher Systems, founded in 1984 in Oklahoma City, Oklahoma, is a leading manufacturer of high quality ductile iron, carbon steel, and stainless steel check valves for oilfield, industrial, and specialty applications. WNS manufactures a full line of high quality stuffing boxes, pumping and flow tees, and cone type packing for the oil industry. WNS is committed to producing excellent products at a competitive price.