Standard Pressure Settings: 75

1-1/2x4 BLK NIPPLE (25)

They have a brass body (size 1/4 in

This 3/4 inch double check valve backflow preventer assembly is designed to prevent the backflow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements

Specifically

1X4 GALV. NIPPLE (25) B-VENT BRACKETS Standard Pressure Settings: 75Galvanized nipples and pipe offer a trusted and easy method of transporting plumbing mediums. General uses for this product are for transporting potable water, compressed air, drainage or to create your own DIY projects. This class of pipe is designed for use with other galvanized fittings.