This New Style Jacuzzi Power Pro LX Jet replaces the old style no longer available, older than 2007. It comes with a white plastic adapter that must be glued in. See Installation Diagram in Photos. This allows for the new style jet to be installed in the old body. Takes only a few seconds to glue the adapter piece in and comes with directions. The reason for Jacuzzi designing a new style, is that the old style jets would fail and pop out. This will correct those issues.
Tech Note : For Spas 2007 - Present, you can save money and purchase the 6541-470, with no adapter clip.