I have a Caldera Geneva that I have owned since new in 2003. I had a problem with a leak. I traced the leak to the euphoria Jet. I took the old one out it was bedded in silicone caulk and retained by a large nut on the underside. The new one has a gasket with it, the old one did not. Does anyone know if the gasket should be installed between the jet and the inside of the tub ( it does not fit well in that position) or between the nut and the underside of the tub, ( there water could follow the thread thru the nut and leak?