Propane Gauge\Leak Detector   See at a glance when your propane level is low. Type 1 for gas grills, RVs and boats. Fits all propane tanks manufactured after 1995.   1 per clamshell.   LP Gas Changeover Valve keeps gas supply flowing continuously even in the middle of the night.The automatic LP gas changeover valve provides continuous gas supply by automatically changing to a reserve cylinder when the service cylinder is empty. The indicator changes color to signal that the service cylinder needs to be refilled. Imagine the convenience of not running out of gas in the middle of the night on a cold night. The optional protective cover is necessary to meet RVIA requirements for use on Motorhomes, travel trailers or other RVs. Remote Indicator This remote indicator eliminates dual cylinder depletion. Here is how it works! Once the above valve switches over to the reserve cylinder, the sensor tells the light box to flash and you will know that one of your cylinders needs to be refilled.  Propane Safety Many changes have taken place in RV Propane connections over the last five years.  It is important to understand the new safety features and how they work together to afford maximum protection and convenience.  The new Type I, ACME connection and its ability to shut off the flow in a fire situation is one of those improvements. Cylinders and tanks with the OPD valve to help prevent over filling is another improvement. You will love the safety and convenience these products bring to your RVing experience. However, please note that any installations and work on your Propane system should always be performed by someone knowledgeable and qualified to do such work.