As of 2002, all LP devices must be equipped with an OPD device. An OPD device is an overfill prevention device and is required by law to be on all LP tanks, bottles and cylinders. OPD devices are required on all DOT and ASME LP tanks. An OPD device insures that LP tanks are not filled more than 80 percent.
Rarely referred to as a handle, service valves can be one of three types. The POL CG 510 is commonly recognized by its five- or six-prong twist handle which has a left-handed hose connection. This valve assembly is currently illegal. This style valve can be adapted with an OPD device. If your tank has been adapted to the new style it will have a three-prong valve.
The second type of valve is called OPD service valve and has a quick disconnect. This type of valve is not permitted on RVs but is common on gas grills. This valve also has three prongs.
The third type of valve is the Type I OPD service valve and is recognized by a black or green connector along with a three-prong handle. If you have a POL valve on your tank, you will need to replace the tank with the new and mandatory Type I OPD service valve. In any case, if your valve handle is not clearly stamped as OPD, you should have it checked for legality by your local LP dealer.
