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The Best Kept Secret In Your RV's Propane System! If your new RV has those nice new propane cylinder valves with the big ACME threads on the ends your the owners we want to talk to . If your cylinders still have the old style valves with the left-hand wrench connections, it won't be long before you will be a candidate for this information too. Since April 1, 2002, it has been in affect that no one can fill propane cylinders that don't have the new OPD feature and those new ODP cylinder valves will all have the big ACME threads on the outside. The old left-handed, wrench type, connections have been replaced with a very user friendly, wrench less, right-handed, big green plastic nut that threads right in to the end of the new valves. The big green nut is on the end of a flexible hose called a "pigtail". The pigtail connects to the RV's propane regulator. Let's talk about a couple new safety features on these new pigtails. Both features are parts of the big green nut. The first is a black thermal-sensitive bushing found just behind the green nut. If this bushing is ever in a fire with temperatures between 240 degrees F and 300 degrees F, it melts and allows the brass nipple inside the nut to move back about 1/4 inch, which closes a small piston inside the cylinder valve totally shutting off the flow of propane. This innovative feature will help mitigate fires or explosions.
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