SID Air Chamber Valves are designed to maintain air retention in your Bestway Lay-Z-Spa air chamber. This replacement air chamber screw valve is compatible with later models of Bestway Lay-Z-Spa inflatable hot tubs. Compatible models include: Bestway Lay-Z-Spa Premium / Miami Model Number BW54112 (Later Style) Bestway Lay-Z-Spa Vegas Later Style (with either single valve or 3 valves) Riviera Saint Tropez New York Paris Vegas Miami Maldives Bali Tahiti Cancun Ibiza Havana Baja Rio St Lucia Bahamas Barbados Madrid Palma Fiji New York Product features: Essential screw valve for inflation and deflation Helps prevent air leakage from the Lay-Z-Spa Direct replacement for lost or damaged valves Screw diameter approximately 22mm