• Certified to ASME B31.3/B31.4/B31.8/CSA Z662 Cat. I
  • 1480 M.A.W.P with 0.5 & 0.6 design factor
  • O-Ring location outside the working area protects from tools and debris
  • Pressure alert valve design without the need for O-Ring
  • Through bores on all wall thicknesses
  • Increased structural strength on the hub for warpage prevention


  • Door designed per ASME BPVC VIII DIV. 1, U-Stamp compliant
  • Pressure alert valve per UG-35.2 of ASME BPVC VIII DIV. 1
  • Clamp screw opening and door load binder assist on 32″ to 48″ (DN800 to DN1200) closures
  • Nace MR0175 compliant material
  • -50° to + 400°F (-45° to 204°C)
  • Viton O-Ring supplied with closure


  • Flanged closure – welded connection or one-piece
  • ASME BPVC VIII Div. 1 with U-Stamp for the door only or full closure (door, hub, and clamp ring)
  • Clamp screw opening assist and load binder on 24″ to 30″ (DN600 to DN750) Closures
  • Custom wall thickness, vents, and other modifications
  • Special materials and O-Rings