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Understanding 5/2 and 4/2-Way Pneumatic Valves

Electric Valve Actuator - How They Work

4 Types of Actuators in HVAC (Damper & Valve)

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