Series 957, 957N, 957Z Reduced Pressure Zone Assemblies provide protection to the potable water system from contamination in accordance with national plumbing codes. Series 957, 957N, 957Z are normally used in health hazard applications for protection against backsiphonage or backpressure
Features:
• 21⁄2", 3" and 4" sizes available with quarter-turn ball valve shutoffs
• Replaceable check disc rubber
• Extremely compact design
• 70% Lighter than traditional designs
• 304 (Schedule 40) stainless steel housing & sleeve
• Groove fittings allow integral pipeline adjustment
• Patented torsion spring checks provide lowest pressure loss
• Unmatched ease of serviceability
• Bottom mounted cast stainless steel relief valve
• Available with grooved butterfly valve shutoffs
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