Lincoln 5490 Lincoln Industrial 5490 1/8 In. NPT Pipe Thread Grease Fitting, 90 Degree Angle, (Blister Pack of 10)

The ball check in the head of the fitting prevents dirt and grit from getting into the bearing. The fittings have a specially formed lip at the fitting base that locks the spring and ball securely in place. Can be wiped clean without forcing foreign material into the fitting and the bearing.