Description
The Watts 7018129 First Check Kit M 957 is an internal control component used in backflow prevention systems. It has a 3″ size, and it provides a factory-matched first check module and disc elastomer for restoring proper sealing performance in HVAC systems. It is placed inside potable water distribution systems. It provides correct unidirectional flow control to maintain separation between supply and protected water lines, and supports compliance with cross-connection control requirements of the unit in the systems.
