Because each Kitchen Faucets needs valves and pipes to deliver the standard water, setting up these systems needs extra in-the-wall plumbing - at a extreme price. You'll also need to check standard water limitations in your area before replumbing your shower. Warm range control. Most of us have experienced a hot and cool "shock" when someone eliminates a bathroom while we shower. Shower Bathroom Faucets with pressure-balance valves prevent this shock; the device feelings an unexpected drop in hot and cool stress and decreases stress on the other side to keep temperature from different more than 2° or 3°F.