Watts 757-OSY 4 - Part of the 757 Series ZC100F-2NH 34 GPM per linear ft

34 GPM per linear ft

the unit includes a 4″ diameter ABS perforated standpipe for subsurface drainage and an 8″ diameter fixed top with heel-proof ductile-iron grate for surface flow capture

Stainless steel spring

ductile iron disc

UPC - 098268428964

Watts 757-OSY 4 - Part of the 757 Series ZC100F-2NH 34 GPM per linear ftThis 4 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. It is ideal for protection at cross connections identified as non health hazards and from other contaminants found at the service line