Lincoln Heavy duty high pressure grease gun with rigid tube extension is made of steel or enhanced durability. Gun has operating pressure of 7500 psig and features knurled handle for positive grip, handy trigger guard to prevent pinching. Extension type: Rigid tube. Operating pressure: 7500 psi [max]. Material: Steel. Connection: 1/4 in NPT female inlet, 1/8 in NPT female outlet. Precision-machined, all steel handle, body and guard bracket provides durability and longevity. Unique, precision control inlet check valve provides ease of handle operation even with increase in pressure. Knurled handle for positive grip. Handy trigger guard prevents pinching. Reversible inlet check seat and hydraulic jaws provide double life. Balanced design reduces user fatigue; Easily repaired for extended life; Power source: compressed air. Balanced design reduces user fatigue. Lincoln Heavy Duty High Pressure Grease Gun provides the durability and precision required for lubrication systems.