Plug 1/4 in Nominal Pipe Size Iron Galvanized BS EN 1562 Class Class 150 For Pipe Schedule 40 MBSPT 1/4 in Outside Diameter 9/16 in Overall Length 150 psi Maximum Operating Pressure 290 psi Max Steam Pressure -5 Degrees F to 570 Degrees F Plug Construction Solid Plug Drive Style 5/16 in Square Includes Pre-Applied Thread Sealant No Includes Seal No 19 1/4-19 Magnetic No Silver