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Installing a plumbing system is a project best left to professional plumbers. Plumbing systems involve tons of moving parts—water supply lines, pipes, drain lines, sewer connections, and connections to appliances like water heaters, washing machines, and dishwashers. Improper installation of your plumbing system can leave your house vulnerable to potential damages that could result in flooding or damage to your home’s foundation. While you can DIY your way through common plumbing problems like fixing clogged drains or leaky faucets, it’s highly recommended that you contact a plumbing professional for most of your plumbing-related tasks, especially installing the system. 

Whether an earthquake gas shut-off valve is required depends on your location and circumstances. Certain cities, states, and even insurance providers mandate them, especially in areas with high seismic activity. In California, for example, while laws vary by county, most jurisdictions require a valve to be installed in newly constructed homes or when a home is sold or renovated. The Los Angeles Municipal Code specifically requires a licensed contractor for installation. Even if not required by law, installing a seismic shut-off valve is a wise safety measure. These devices automatically cut off the flow of gas during an earthquake, which can prevent gas leaks, fires, and explosions. It is recommended to check with your local building department for specific laws regarding installation, permitting, and inspections, and to ensure the valve you install is on your city's list of approved models.

You cannot replace a shower valve without turning off the water. Always turn your water off before doing any kind of plumbing work—and this project is no exception. Turning off the water is a best practice for personal safety and to keep things in your home dry.

No, they have multiple designs. Choosing a bathroom fixture will depend in large part on the current configuration you have. You will want to pick a model that matches the faucet holes currently in your sink, countertop, or wall. If you want to make a complete changeover, you may need to buy and install a new vanity and sink at the same time you purchase your faucet.