Square Head Plug 1/4 in Nominal Pipe Size Stainless Steel 304 Class Class 150 For Pipe Schedule 40 Male NPT 1/4 in Outside Diameter 18.9 mm Overall Length 300 psi Maximum Operating Pressure 150 psi Max Steam Pressure -20 Degrees to 350 Degrees F Plug Drive Style 2 in Square Includes Pre-Applied Thread Sealant No Includes Seal No 18 Magnetic No