Description
The Scully VS-528 Ventalarm Signal 2″ x 2″ VS-524 is a tank vent monitoring part that indicates safe or full standard conditions during fuel oil filling operations. In HVAC systems used for heating equipment and related storage tank setups, it supports preventing overfilling by providing an audible change in vent sound when liquid reaches the sensing level. It operates through a pressure-based whistle design where airflow exits during filling and stops when the liquid level closes the vent path. It is fitted directly into the opening using standard threaded connections.
