Air pump for lifting, bolting, or applying pressure with a hydraulic cylinder (sold separately) in settings where compressed air is available or ignition sources are prohibited * Advances and retracts a single-acting cylinder or powers a hydraulic tool, and can hold a load * Internal pressure relief valve helps prevent pump overload * Two-speed pump for applications where there is little or no load initially, but where increased force is needed when the load is applied * Maximum operating pressure rating of 10,000 pounds per square inch (psi)