Faucet Adapters are usually needed to hook up a diverter to the faucet. This page has most standard and even many unusual sizes. Contact us if you don't see the size you need or if you need help on this.
Note: Standard Diverters have female threading and will fit male 20-22 mm aerators or adapters.
These pictures may help you figure out which size to get. These all fit (on the other end) the standard diverters that come with most water ionizers. Use a similar measuring tape to match your faucet aerator to the adapter size. Some faucets need an extra-long adapter (see last picture).