Steel Hex Headless Plug 3/8 Inch NPT Male, PK 50, Interstate Pneumatics, Mfr#: FPP62S-50K

These Steel Headless plugs are manufactured with threads that confirm to the American standard taper pipe thread and have a good resistance to vibration and pipe movement. The tapered threads of the pipe mesh with the tapered thread of the fitting to form an air tight seal.