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The air admittance valve, or AAV, is a spring-loaded mini-vent that sits right next to your washer. It acts in place of a standard vent stack connection, opening to let air into the drain whenever pressure builds up. It otherwise stays closed to prevent sewer gas from escaping into your home. This gives the washer’s plumbing system the air it needs when water enters or drains.

Drain pipes carry wastewater from sinks, toilets, showers, and other fixtures to the main sewer line. They’re typically located within the walls and floors and beneath a home’s foundation. Meanwhile, sewer pipes transport collected wastewater to a septic tank or a municipal sewer system.

To clean gunk out of a sink drain, pour in a half cup of baking soda, then 1 cup of white vinegar. The two will react chemically; let them fizz for 15 minutes, then rinse with boiling water. Repeat these steps if necessary for particularly dirty sink drains, and consider a drain snake if there are clogs.

The signs of a bad mixing valve in a shower include water that’s scalding hot or freezing cold, a leak in your shower, a lack of hot water, and low water pressure. If you suspect there’s a problem with the mixing valve, call a pro to inspect your shower and replace the valve if necessary.