2" - 4" 1st Check, 20-30
The 2" - 4" First Check Valve Assembly includes:
- First Check Valve Assembly
- Cover Seal O-Ring
- Retainer Bolt O-Rings
Dual Action™ Check Module
The Patented Dual-Action Check™ (US8875733) is the core technology behind the superior performance of the Deringer & Magnum Backflow Prevention Lines. The Dual-Action Check™ combines all of the best features of industry standard “poppet” checks and “swing” checks into a single high performance check module.
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
Initial 25% of check stroke is that of a poppet check
Consistent static sealing
Excellent resistant to fouling
Reliable check closure
Stable flow characteristics at lower flow rates
Final 75% of check stroke is that of a swing check
Minimal friction loss at high flow rates
More linear flow path water through valve
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