Overview Additional Info Reviews Product Description Countersunk Plug, Hex Socket, Plug, MNPT End, 150 psi, Carbon Steel, Black, -20 to 350 deg F, Domestic These countersunk plug hex sockets, made by Midland Metal, are made of steel. Product Additional Info Additional Tech Info Product Documents Product Videos Custom Field Product Reviews Write a Review Write a Review × Midland Metal Countersunk Plug, Hex Socket, Plug, MNPT End, 150 psi, Carbon Steel, Black, -20 to 350 deg F, Domestic Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *