Flange Gasket, Full Face, 1/2 in Pipe Size, 3 3/4 in Outside Dia., Bolt Holes 4, 27/32 in Inside Dia., Metal Detectable No, Material of Construction Neoprene, 1/8 in Thickness, -30 Degrees to 250 Degrees Temp. Range (F), Color White, Standards ASME B16.21, ASTM D2000 BC 607, FDA