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Vacuum Port Adaptor - Dual poppet

The DUAL POPPET Vacuum Port Adaptor mounts to the top of the Prevco DUAL POPPET Pressure Relief Valve for the purpose of pulling a vacuum and backfilling with a dry inert gas such as Nitrogen.



Prevco’s pressure relief valve, vacuum port adaptor (VPA) is a useful addition to our line of subsea underwater housing support equipment. It addresses an all too common problem. When vacuum leak testing an enclosure, there is often a loss of vacuum when replacing the vent plug and/or a loss of pressure when back-filling with Nitrogen. This small assembly provides a key link between our industry standard, Portable Vacuum/N2 Backfill Kit and a Prevco Dual Seal DUAL POPPET Pressure Relief Valve. This ensures that a housing can be sealed with an internal vacuum and that any back-filling gas is not mixed with atmospheric air when the PRV or vent plug is replaced. The pressure relief valve, DUAL POPPET vacuum adaptor, addresses this by allowing both procedures to be performed through the Hi-Pressure, DUAL POPPET pressure relief valve. The adaptor, temporarily mounts onto the PRV and physically opens the PRV poppet while the vacuum is being pulled. The poppet remains open while backfilling with Nitrogen and then closes after use, minimising the possibility of losing first vacuum and then pressure.

Attaches to DUAL POPPET Titanium PRV
Physically opens PRV poppet
Allows a vacuum to be pulled through the PRV
Nitrogen backfilling through PRV
Poppet valve closed after use

Technical Specifications


  • Attaches to DUAL POPPET Ti PRV
  • Allows for vacuum and Nitrogen backfill
  • Avoids loss of pressure


  • Anodized Aluminum shell
  • Stainless Steel thumbwheel
  • Buna O-rings


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