The DeringerTM 20X Double Check Valve Assembly is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions

Features
• Oversized checks for extreme performance
• Integral shutoff valves indoor/outdoor application
• 100% stainless steel housing
• Tamper-resistant test cocks
• Patented Dual-actionTM check modules
- Poppet action at low flow
- Swing action at high flow
• Silicone elastomer check discs
• Prewired supervisory (alarm) switches
• Flanged adapters available
• IPS grooved ends