Installed properly through a wall and sloping downwards, remaining water is forced out of the spout. This anti-siphon device is also a vacuum breaker. Most building codes now require this type of device and it is ready built into many new outdoor faucets; existing outdoor faucets can be modified to add this anti-siphoning feature. Let's look at how to install these freeze-resistant outdoor faucets, anti-siphon valves, and necessary shut off valves for your new or existing outdoor plumbing. This anti-siphon also prevents unsanitary or contaminated water from being pulled back through your garden hose, which can cause contamination of your home's water supply. This type of outdoor faucet installation is not very expensive (costing anywhere from $5 - $100, depending on the items you need for your particular situation). The main work involved is connecting new fittings if you have plastic or PVC pipes, or soldering work if you have copper pipe work. Let's look at how you can do this project yourself quickly and accurately.
Planning for Installation
Your first step when installing or upgrading your freeze-resistant hose bibb is to call your local plumbing inspector to determine the requirements in your locality when it comes to this type of work. You may need a permit. Plumbing codes vary around the U.S., but most typically require that you install ½" to ¾" minimum (inside diameter) supply lines running to the hose bibb, approved vacuum breaker or a hose bibb with built in vacuum breaker (anti-siphon), and a stop valve or shut off valve.
Next, you will need to measure your existing plumbing and sketch out a new layout for installation of your outdoor faucet. On your sketch, note where each fitting and each pipe should go, and whether the part has threaded or solvent welded joints, and describe the part on the sketch. Determine what supplies you will need for the project and make a shopping list. You can choose from various lengths of out door faucets, ranging from eight inches to twelve inches, and diameters (inside) from ½" to ¾". The diameter that you select should be determined by the local code governing your area and the length will simply be what is needed to give you enough room to attach the fittings and pipes.
Installation is pretty straightforward. First, shut off the valve to the main supply of water (where the water enters your home). Drain the water system, and remove the old pipe and hose bib. Attach the new outdoor faucet, and move inside to reattach the rest of the assembly, working from the old pipe end to the new hose bibb. Installation shouldn't take very long, as you are basically only replacing the hose bibb, not installing a completely new faucet from scratch.
Tips for Installation of Your New Hose Bib