Have a project in mind and need a Healthways ( I think) single hose diaphragm. The one I need is the silicone version that is about 3.15 inches across. I have the harder, more plastic type. These are a little bit larger than any others I can find and I need that width for my project. I am open to buying, trading or other exchanges. I have a number of regs and reg parts to barter with.