... Fitting Material:brass Degree: 180 degree Model :1/2 NPT Also have SAE,BSP etc. 1/2" NPT Pipe Thread Grease Fitting Description :Lubrication ... ,such as automobile, agricultural, marine, truck, machinery etc.We provide a full line to serve your industrial line , SAE,BSP,DIN ... time, and the pressure supplied by the grease gun forces a small captive bearing ball in the nipple to move back ...