Watts 957N-DOSY 4 - Part of the 957 Series Inserta Tee Threaded connection

Threaded connection

ductile iron grate with 37 square inches of free area and a 4 inch no hub outlet

NPT male inlet and 3/4 inch NPT female outlet connections

This kit consists of disc assembly

pipe connector (70154

Watts 957N-DOSY 4 - Part of the 957 Series Inserta Tee Threaded connectionThis 4 inch N pattern reduced pressure zone assembly backflow preventer helps prevent the reverse flow of fire protection substances and 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. This extremely compact and lighter than a traditional designed assembly is approved for horizontal installation