Drinkwater Products

S-500 Threaded Quick Opening Closure

The Stark S-500 threaded closure represents historically the most widely used closure style in the oil and gas sector. Based on the industry desire for robust and cost-effective solutions, Stark improved upon the industry standard design to bring operation to a new level. Features to avoid hammering and strengthen operator control were incorporated into the otherwise proven design. The S-500 is manufactured in diameters ranging from 2” to 52” (DN50 to DN1300) and pressure series 150 through 1500. 


  • Proven and robust design
  • Economically priced
  • Certified to ASME B31.3/B31.4/B31.8/CSA Z662 Cat. I
  • Flat sealing surface for best seal results on all sizes
  • Bidirectional Hinge design allows the cap to open to the left and right side


  • 2” to 4” (DN50 to DN100) closures designed for wrench opening
  • Opening tool supplied with 6″ to 52″ (DN150 to DN1300) closures
  • PAV per UG-35.2 of ASME BPVC VIII DIV. 1 on 6” and larger (2” to 4” optional)
  • Cap designed per ASME BPVC VIII DIV. 1, U-Stamp compliant
  • Nace MR0175 compliant material
  • -50° to + 400°F (-45° to 204°C)


  • Flanged Closure – welded connection or one-piece
  • ASME BPVC VIII DIV. 1 with U-Stamp for whole closure (cap and hub)
  • Opening Wrench for 2” to 4″ (DN50 to DN100)
  • PAV per UG-35.2 of ASME BPVC VIII DIV. 1 on 2″ to 4″ (DN50 to DN100)
  • Stainless Steel and Inconel weld overlay on sealing surfaces
  • Custom Wall Thickness, vents, and other modifications
  • Special Materials and O-Rings
  • Horizontal, Vertical, or Inclined hinging
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