This 3-Stage Universal PCP Hand Pump is great for those just getting into shooting pre-charged pneumatic air rifles.OPERATION - Follow assembly instructions included with pump and make sure that components are properly tightened prior to use. Connect pump to your rifle and tighten the bleed valve and begin pumping at a slow and steady rate. This will prolong the life of your pump and seals by not allowing them to become overheated and prematurely age.MATERIALS - The Stainless Steel shaft is built to withstand pressure up to 4500psi/310bar. Comfortable pump handles make for quick pumping. Includes inline filter for debris and moisture.