Kuff, Shut off the power to the tub, Open up the control bow, you need a phillips screwdriver, loosed the screws on the cover, lift up and pull off, You will see the ozone generator in the top of the box, follow the wire off the lower left side of the ozone to the connector , unhook, now at the generator there are 2 metal tabs hanging down with a screw in each remove the screws, pull out the ozone, put the new one in, align the screw holes( it may be a partial hole on the generator, go ahead a screw into the holes, plug in, put cover back on, turn the power on , you should be set...