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2" - 4" 1st Check, 40-50

The 2" - 4" First Check Valve Assembly can be used on the Deringer 40 (RP) & 50 (RPDA-II) models or the Magnum 40 (RP) model and are for sizes 2", 2 ½", 3" and 4" and comes pre-assembled from the factory ready for installation

The 2" - 4" First Check Valve Assembly includes:
  • First Check Valve Assembly
  • Cover Seal O-Ring
  • Retainer Bolt O-Rings
Note: This check valve assembly is for the 2" - 4" Deringer 40/50 and 2" - 4" Magnum 40 models only. The first and second check valves are not interchangeable.



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True-Seal™   Check Modules

The True Seal Check Valve was designed to incorporate a poppet only motion during the check stroke and is used exclusively on the first check assembly on the Deringer RP and RPDA models and the Magnum RP model. This design allows a more consistent pressure loss across the check valve which helps maintain a steady and continual closure of the Relief Valve.

  • Light weight engineered polymer components
  • Modular for easy removal of complete check from body
  • Easily disconnect spring tension for safe check servicing
  • Replaceable Silicone Rubber Elastomer Disk
  • Excellent resistance to fouling.
Skewed View

Poppet Action


  • 100% of check stroke is that of a poopet check
  • Consistent static sealing
  • Excellent resistant to fouling
  • Reliable check closure
  • Stable flow characteristics at ALL flow rates
Low Flow Poppet Action



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