1" FNPT x Union FNPT Dual Check Backflow Preventer
Honeywell BP701 Dual Check Backflow Preventer features 1" NPT connections and may be installed in either a vertical or horizontal position and should be installed immediately down stream of the water meter.
Specifications of Honeywell BP701:
1" FNPT x Union FNPT Dual Check Backflow Preventer has an average 5 rating out of based on 1 user review.
Have tried several units and found this one far superior than the others. No leaks, no hammering, no reduction in flow using the 1" for the 3/4" system I have. Thanks a million for this product.