1.Lock and Seal – Grease Gun Coupler a unique, patented design. Its reinforced jaws and highquality gasket ensure a trouble, longlasting performance even at the extreme pressure of 14,000 PSI. Its patented design makes it virtually leakage and helps prevent accidental detachment. Please note: grease gun is not recommended for joints that are less than 16 mm. 2.Robust Build Quality – Manufactured using premium zinc coated alloy steel for exceptional performance and durability. It's professionalgrade, with an industryleading 14,000 PSI operating pressure, making it a great choice for both commercial shops and automotive centers, as well as any home garage. 3.Easily OneHand Operation – Grease Gun Coupler uses a unique and patented retraction mechanism, specifically designed for onehanded operation. It's convenient and easy to locate and lock onto a Zerk fitting even without a clear line of sight. No need to hold it in place. No more mess. 4.Universally Compatible – Designed to fit all standard 1/8 NPT grease guns on the market. Simply replace your existing unit with Grease Gun Coupler and you're ready to go. Whether you're an auto mechanic, maintain heavy machinery or farm equipment, this heavyduty coupler will deliver highpressure, mess lubrication.