Performance Tool W54228 Lock On Grease CouplerAllows you to lock on the fitting with just a slight push, releases with the same minimal effort. Fits most grease guns and accessories. Positive seal prevents leakage while pumping grease up to 10000psi. The small design allows you into tighter areas than other lock on couplers. Allows you to lock on the fitting with just a slight push, releases with the same minimal effort Fits most grease guns and accessories Positive seal prevents leakage while