HNA has been engaged in manufacturing of high quality mud pump parts and accessories since early 1990&＃039;s. We offer a full line of Fluid End Expendables for popular mud pumps in the world, including Continental Emsco, National, Gardner Denver, Oilwell , Ideco, Wheatly, Wilson, Wirth, OPI, Ellis Willianms, etc. HNA currently manufactures over 2,000 major products such as Liners, Rods, Valves & Seats and other expendables. In fact, HNA has revolutionized the triplex premium chromium liners and our patent HP liners have dominated the market since late1990&＃039;s. Chinese Patent No. ZL 03 2 69409.1. HNA guarantees that our parts are completely interchangeable with those offered by the OEMs with no modification of existing equipment. The warranty extended by HNA meets or exceeds the warranties offered by the OEMs. HNA is a private company based in Qingdao, China, occupying 150,000 square feet of manufacturing space located on 20 acres of land Our mission is to supply quality products at competitive prices to drilling contractors through our distributors all over the world.