Relief valve protects system and cows in case of regulator failure.
Relief Valve for Sentinel Controllers models M350 and M500 and similar sized large volume controllers
Mounts 3 inch NPT
protects against occurrences of high vacuum.
For systems with CFM's over 250, two are recommended.
Set at 1 inch above your operating vacuum level.
GEA # 4999-1082-231