What device is used to identify gas leaks in plumbing systems?

A gas leak detector is specifically designed to identify the presence of gas leaks in plumbing systems. This device works by sensing the chemical composition of gases, such as natural gas or propane, and can alert users to the presence of hazardous concentrations. These detectors are equipped with sensors that can detect even small amounts of gas, making them crucial for ensuring safety in environments where gas is used or stored. Regular monitoring with a gas leak detector can prevent dangerous situations, such as explosions or health hazards due to inhalation of toxic gases.

The other options serve different functions within plumbing and gas systems. A gas shutoff valve is used to stop the flow of gas during emergencies or maintenance, but it does not detect leaks. A manifold is typically used to distribute gas to different outlets but does not monitor for leaks. A faucet, while essential in plumbing, is unrelated to gas detection and simply serves to control water flow. Thus, the gas leak detector stands out as the appropriate choice for identifying gas leaks.