Description
The Scully WL-100 1-1/4″ Whistler Fill Signal 00402 is an audible vent pipe insert component used to indicate the filling level of aboveground storage tanks. In HVAC systems, it is commonly applied in fuel oil storage and delivery setups where it provides a whistle sound through the vent line during tank filling. The part is set up inside the vent pipe and produces an audible signal that stop when the tank reaches full capacity, helping prevent overfilling and spills. It is typically used in residential and commercial heating fuel systems to support safe, controlled fuel delivery.
