Watts LF757NDCDA-OSY-GPM 4 - Part of the LF757DCDA Series R304 Detectable Warning Surfaces Features Standard construction includes Z3

Features Standard construction includes Z3 sealed spring cage and stainless steel corrosion resistant adjusting and cage screws for accessible outdoor or pit installations

flush finish

cohesive aesthetic

a self-locking polyethylene dome

ZB415H-4NH

Watts LF757NDCDA-OSY-GPM 4 - Part of the LF757DCDA Series R304 Detectable Warning Surfaces Features Standard construction includes Z3This 4 IN lead free double check detector backflow preventer assembly prevents the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. It is designed for non health hazard applications and may be installed under continuous pressure service to protect against both backpressure and backsiphonage. It is used primarily on fire sprinkler lines when it is necessary to monitor unauthorized use of water