Over Pressure Rings

This centering ring accessory creates a barrier on the outer diameter of the elastomer sealing ring to prevent “blow out” due to the presence of pressures greater than 1 standard atmosphere within a vacuum system. A centering ring assembly with an over pressure ring can withstand up to 100psi of pressure depending on the flange you are using.



  • High Vacuum Rated to 1×10-8 Torr
  • Compatible with all ISO standard vacuum flanges
  • Reusable
  • Quick sealing and disassembly



  • 304 Stainless steel


Product Notes

  • Retains o-ring if your system is exposed to a burst of pressure

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B C Max PSIG 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4000073Reference NumberQF16-075-OPRA 1.25B 1.19C 0.35Max PSIG 1003D CADLoginDrawingLoginUnit Price$8.50Contact
Part ID4000074Reference NumberQF25-100-OPRA 1.66B 1.58C 0.35Max PSIG 1003D CADLoginDrawingLoginUnit Price$9.601
Part ID4000075Reference NumberQF40-150-OPRA 2.25B 2.17C 0.35Max PSIG 753D CADLoginDrawingLoginUnit Price$10.759
Part ID4000076Reference NumberQF50-200-OPRA 2.75B 2.62C 0.15Max PSIG 503D CADLoginDrawingLoginUnit Price$13.0045