What are the different types of Valves? [Notes & PDF]

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So an AAV is an air admittance valve. It prevents your drain line from siphoning out the water seal in your P-Trap. If that sentence looks like hieroglyphics to you. Don't feel bad plumbing isn't as simple as people seem to think it is. If this problem isn't fixed. You'll have a master bathroom that smells like sewer gases and grows mold like nobody's business! | C and H inspections

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