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M400

Stainless Steel Reduced Pressure Zone Assembly Backflow Preventers

  • Protects against backsiphonage, backpressure, and the fouling of either check valve
  • Entire valve body and closure sleeve manufactured from 304 stainless steel
  • Patented link check provides low pressure loss
  • Extremely compact design is significantly lighter than traditional designs

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific M400

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