Automatic Air Relief Valve #9056

AUTOMATIC AIR RELIEF VALVE DESIGNED TO ACTIVATE WHEN SEALED VACUUM SUCTION EXCEEDS APPROXIMATELY SET INCHES OF WATER. IDEAL FOR HIGH-PERFORMANCE CENTRAL VACUUM SYSTEMS INCLUDING  PREVENTS EXCESSIVE PRESSURE BUILDUP BY RELEASING AIR AT THE PRESET THRESHOLD, PROTECTING YOUR SYSTEM AND EXTENDING EQUIPMENT LIFESPAN. ESSENTIAL MAINTENANCE COMPONENT FOR SEALED CENTRAL VACUUM INSTALLATIONS.