Knowing when liquid is getting low or high in a 45 gallon drum is important to many people who either draw liquids from or empty liquid into such drums. It is easy to run out of the required liquid or to have an overflow, both of which occurrences are not welcome.
Cynergy3 have introduced a range of models (SSV66) to suit this specific application. Switches manufactured in Stainless Steel with 3/4NPT mounting thread can be mounted through the threaded “bung hole”. There are versions for indicating high level, low level or high and low level.