The Black Diamond Slim Swivel 360° Coupler is designed for use with hand-operated grease guns, giving you full 360° swivel movement and the ability to lock at any 45° position for better control. The 45° angle helps reach narrow, hard-to-access grease points, while fully hardened spring steel jaws provide a secure grip and extended service life. A spring-loaded ball check valve helps retain pressure, and a hexagonal nut makes tightening easy. Threaded 1/8" NPT with a 3,000 psi working pressure.