This adapter is designed to work with certain Bestway SaluSpa AirJet tubs. This has been tested on the SaluSpa Miami, but should also work on the Lay-Z-Spa St Moritz and possibly a few others. It is designed to adapt the threaded fitting on the Intex LED module to the twist lock fitting on the Miami spa. Using the LED with this adapter replaces the piece designed for running chlorinating tablets in the tub, so chemical maintenance will need to be done by other means. If your spa does not use the part as shown above, the Universal adapter might be the right fit for you.