Backwater Valves S-640 / 641

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LEGEND MODELS S-640/S-641 backwater valves are constructed of ASTM D1784 virgin resins that will not rust, corrode or pit. They are designed for use in residential and commercial applications to prevent backflow in drainage systems. The stepped construction promotes efficient flow and helps prevent clogging. The access cap facilitates ease of clean-out or repair.

• Stepped body design promotes efficient flow
• Access cap allows ease of clean-out or repair
• Flapper and cap O-ring create a positive seal against sewer gasses
• Manufactured in an ISO 9002 accredited facility
• Manufactured using 100% virgin resin
• Designed for DWV installations operating at pressure less than 50 psi
• pressures will exceed 50 psi

• UPC/IAPMO and IPC Listed: File number 4790
• Manufactured in compliance with ASME A112.14.1-2003
• End connections comply with ASTM D2665