Abstract: An adapter is described for selectively converting a conventional shower to a steam sauna. The adapter includes a spray mist nozzle for developing a spray mist. In an alternative preferred form, water spray orifices are provided in addition to the spray mist nozzle and are separately controlled by a plate valve mounted to the handle with provisions for selective manual operation. The handle and attached spray nozzle are connected to the shower water outlet to selectively deliver water from the shower water outlet under pressure to the spray nozzle. A mount is provided for operably securing the spray nozzle to one of the shower stall walls; or more particularly, to a deflection plate which in turn is mountable to the one shower stall wall. The deflection plate is oriented angularly in relation to the spray nozzle to receive and deflect spray therefrom.