Eaton Weather head C3169X1 Carbon Steel Fitting, Hex Socket Plug, 1/16" NPT Male (Pack of 10) 1/16" NPT male plug for closing the end of a pipe or fitting Carbon steel for durability and resistance to rupture under high pressure Zinc plated for resistance to corrosion 6,000 PSI maximum working pressure Hexagonal socket end for tightening with an Allen wrench