New design electronics provide high reliability and long life with zero current draw except for the short periods required for level checking. Senders are simple, solidly constructed units with no moving parts, thus no floats to stick. Hookup consists of simply connecting 12 VDC power and the two-wire senders. Fireboy™-Xintex™ has designed a line of liquid level gauges that are built to the quality standards of all our equipment. Senders are available for either threaded or flanged top-of-tank installation. Threaded senders are designed to fit tanks with 1-1/2" NPT threaded top port. Choose either one-tank or two-tank monitors (sold separately) with appropriate threaded or flanged senders.