SSV66 series float switches are designed to offer High, Low or High & Low level monitoring for 45 gallon drums or similar height tanks. These switches can be fitted from the outside of the drum, through the 3/4"NPT bung hole, or via a 3/4"NPTboss on a tank. High level indication is at 24mm from the lower end of the mounting thread. Low level indication is at 813mm from the lower end of the mounting thread. See also M12 cable sets in Custom Solutions.