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Deringer 20/20G

Lightweight Stainless Steel Double Check Valve Assembly Backflow Preventers with Integral Butterfly or OSY Shutoffs

  • Integral shutoffs for shorter lay length and lightweight construction (Deringer 20 only)
  • Tamper-resistant test cocks
  • Dual-action check module for low- and high-flow performance
  • Prewired supervisory switches (Deringer 20 only)
  • Bow-seal™ full access cover for lower weight and easy access to valve internals

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific Deringer 20/20G

Approval/Certification Information

For product-specific approval information, please refer to the product’s specification sheet or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:


ASSE CSA FM Approvals NSF
UL ULC USC WQA