Hollow Hex Head Plug 3/8 in Nominal Pipe Size Carbon Steel Zinc-Plated Male NPT 5/8 in Outside Diameter 7/16 in Overall Length 7 600 psi Maximum Operating Pressure -20 Degrees to 800 Degrees F Plug Construction Cored Plug Drive Style 5/16 in Hex Includes Pre-Applied Thread Sealant No Includes Seal No 3/8 in -18 Magnetic Yes