Designed to meet current codes for overfill prevention. Alarm uses a 9 volt battery to operate,and is intrinsically safe to ANSI/UL 913. 100 decibel alarm alerts delivery person when fluid in tank reaches the predetermined level. Level is adjustable for specific applications. Unit comes ready to install with Alarm, float switch, batteries and one length of 1/8? pipe. May be ordered with #1313 sight gauge, (#1350), for complete liquid level monitoring and alarm.