This FEBCO Series 850 Small Double Check Valve assembly is a 3/4 inch backflow preventer designed to prevent the backflow of polluted water into potable water supplies from backsiphonage and/or backpressure. It is ideal for continuous pressure piping applications and non-health hazard cross-connections.

It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing standard material product, consult your local water authority, building and plumbing codes.

Key Features

• Bronze body construction for superior durability.
• Compact modular design for easy maintenance with a single access cover for in-line repairs.
• Includes a freeze sensor for use with SentryPlus Alert® technology to signal facility personnel when temperatures approach freezing.
• Freeze alerts can be integrated with Wi-Fi networks, Building Management Systems (BMS), and Irrigation Management Systems (IMS) via an add-on connection kit (sold separately).
• Equipped with union end connections and quarter-turn ball valve shutoffs.
• Features two in-line independent positive seating check modules with captured springs and replaceable check discs and seats.
• Top mounted test cocks for simplified testing.

The freeze sensor solely provides alerts about a possible freeze event and cannot prevent a freeze event from occurring. User action is required to prevent freeze conditions from causing product and/or property damage. An add-on connection kit (sold separately) is required to activate the freeze sensor's communication features.