The LiquiLevel FD Mechanical clock gauge designed for measuring tank contents by a float that is installed inside the tank and goes up and down with the level. Whilst also popular for oil and diesel storage tanks, it is most commonly used as a domestic heating oil tank gauge. LiquiLevel FD is also suitable Waste oil, urea solution (AdBlue), vegetable oil, rainwater and other liquids. Supplied as standard with 1 1⁄2” BSP Male for easy and quick installation to the top of the storage tank.