ZO-151 Delzone Portable Ozonator W/Air Pump 120V Horizon # 42-133-1175 Manf. Delzone Manf. # ZO-151 ZO-151 Ozonator For installation into spas with water capacity up to 1,000 gallons. Designed for portable (dispersion stone) or permanent (thru wall) installation. Generator contains its own ozone pump and operates independent of the spa pump system. Complete installation instructions and install kit included