The class III boomers ( TC-35 / 40 / 45's ) have the option for 3 remote valves. They are set up in a "stacked" configuration. So you would have to have valve kits 1 and 2 for the kit on e-bay to work. Go back up to the orginal post by "Pineridge" and click on his TC-40 link. He has a section on installing the remote valves. He has a excellent web site to visit and is also very knowledgeable on the Class III Boomers.