I had an extend a stay on my last coach, which we use all winter. My new FW also has the center tank with the electric shut off. Checking out the fittings I saw they were all different from the Extend a Stay. Talked to my local shop, found the owner had the same set up. So he plumbed the unit as it is instructed (between the gas valve and regulator) and ran a shielded access line to the side, where I can remove the plug and attach my hose and tank. It's working great. Cost one hour labor plus parts.