I have to wonder about an airgun manufacturer that misspells its own name. Click on the link provided above and go to "About Huben". The last two paragraphs: "In addition, to enhance the gas storage pressure of PCP airguns and increase the number of firings, HUNBEN has also developed a manual pressure pump working under a pressure of 35 MPa and a constant pressure valve that adjusts the pressure. With all these features, HUBEN products are bound to bring you unprecedented using experiences. As it goes global in 2015, HUBEN will continue to cater for your needs!"Just sayin'.