Grainger Approved, Solutions That Make a Difference 304 Stainless Steel Blind Flange Designed to blank off pipelines, valves, and pumps, or as an inspection cover, this GRAINGER APPROVED blind flange features 304 stainless steel construction for very good corrosion resistance. Model is sometimes referred to as blanking flange and is ideal for use with air, water, oil, natural gas, and steam. Pipe Fitting Material / 304 Stainless Steel Fitting Schedule/Class / Class 150 Pipe Size - Pipe Fitting / 4 in Fitting Connection Type / Welded Max. Pressure / 150 psi Outside Dia. / 9 in Number of Holes / 8 Temp. Range / -60 Degrees to 450 Degrees F Standards / ANSI B16.5, ASTM A182