Performance characteristics：The piston type hand pressure pump has an accurate and adjustable oil discharge, which is easy to adjust. A check valve is provided to prevent the discharge of oil agent from flowing back. Easy to install and use.This hand-pressed thin oil lubrication pump saves energy and protects environmental cleanliness. Compatible with its distributor: PV series couplings. Supporting measuring parts: DPC.DPV series. Oil viscosity: 32-250cst.Specifications and technical parameters: It should be noted that the HYA type can only press the handle once when filling oil, and after the oil supply is completed (the handle recovers by itself), the next action can be carried out to avoid damage to the lubrication pump parts.