1.1 These requirements cover devices for use on stationary containers or portable LP-Gas containers that consist of a shutoff mechanism that works in conjunction with a liquid level sensing device that shuts off the incoming flow of LP-Gas during a refilling operation when the liquid level reaches a predetermined point. The sensing mechanism may be a float, dip tube, or other type of sensor that is intended to cause operation of the shutoff mechanism. An overfilling prevention device may be a separate component intended for installation on cylinder or fill valves designed for such purposes, or may be incorporated into the design of a cylinder or fill valve assembly. Overfilling prevention devices may be designed for use in automotive applications.

1.2 Overfilling prevention devices covered by these requirements are for use in applications covered by the following standards:

1. a) Liquefied Petroleum Gas Code, NFPA No. 58.

2. b) Outdoor Cooking Gas Appliances, ANSI Z21.58/CGA 1.6-M95.

3. c) Standard on Recreational Vehicles, RVIA A119.2.