Steel frame: ASTM A234 grade WPB, in compliance with ANSI B16.28. Steel sight glass piece : according to SCH 40. Flange: ASTM A105, in compliance with ANSI B16.5Class 150lbs; JIS 10K or DIN is also available on request. Standard: Two fixed anges; one loose and one fixed anges or two loose anges are on request. Lining: Pure FEP I PFA in compliance with ASTM D4894. Glass : Toughened with PTFE gasket Other nominal sizes are available on request.