Single and Two-Hole. If you have one hole on your sink, you need to use a faucet that has a single stem and a handle or handles that are attached directly to the faucet itself. If you have two holes, you have two options. You can use separate mixing taps -- two single-hole faucets, each with its own faucet.emove the Old Faucet. If it's unclear when looking at the sink and faucet how many holes there are in the sink or vanity top, you will need to remove the old faucet. Turn off the water supply to the sink and use a basin wrench to unscrew the nuts holding the faucet in place below the sink.