Zurn 3-375AST 3" Reduced Pressure Principle Backflow Preventer with Stainless Steel Body

Application

Designed for installation on potable water lines to protect against both backsiphonage and backpressure of contaminated water into the potable water supply. The Model 375AST provides protection where a potential health hazard exists. Ideal for use where lead-free* valves are required.

Features

• Short lay-length for small space installation
• NRS, OS&Y, or Butterfly shut-off valves available
• Available in flanged, grooved, or grooved X flanged end connections for installation versatility
• Ideal for any backflow replacement
• Utilizes Zurn Wilkins low headloss Compound Check for reliable and superior performance
• No threads or taps in body or cover, eliminating exposure to corrosion

Materials

• Main valve body: Ductile Iron ASTM A 536
• Access covers: Ductile Iron ASTM A 536
• Coatings: NSF Approved fusion epoxy finish
• Internals: Stainless steel, 300 Series NORYL™
• Fasteners: Stainless Steel, 300 Series
• Seal rings: EPDM (FDA approved)
• O-rings: Buna Nitrile (FDA approved)
• Springs: Stainless Steel, 300 Series
• Sensing line: Stainless Steel, braided hose

Specifications

• Sizes: 2 1/2", 3", 4", 6", 8", 10"
• Maximum working water pressure: 175 PSI
• Maximum working water temperature: 140°F
• Hydrostatic test pressure: 350 PSI
• End connections: (Grooved for steel pipe) AWWA C606 (Flanged) ANSI B16.42