【Designed with Three-Claw Coupler】Locking Grease Coupler is designed with a three-claw coupler, which allows you to open and close the grease fitting more easily. 【Spring Sleeve Lock】Grease Coupler Locking has a spring sleeve that locks the coupling in place and strengthens the connection between the straight coupling and the angle coupling, preventing air leakage and making grease filling more effective.