What Is It? - Reduced Pressure Zone Backflow Preventer (2)

In this series of videos you are shown items that are common in the plumbing trade. Some may be familiar, but, some might make you say; What Is It?

[@JimmyBackflow]

Water continuously discharges out of the relief valve if the second check valve is not drip tight and backpressure is present. If the second check valve is drip tight it will not discharge. Water will also continuously discharge out of the relief valve if the first check valve is not drip tight and there is no downstream demand. A drop in supply pressure will cause the relief to spit and stop.

[@zackhines2569]

What state are you in?

[@theplumbingacademyinc.2209]

Massachusetts.