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Field glossary

AAV

Air admittance valve, a one-way valve that admits air on negative pressure and seals against sewer gas; often called a Studor vent after the original brand

Used across 4 Anvilfield field guides, most in Plumbing.

Also defined as

  • Air admittance valve, a one-way valve that admits air and seals against gas, accepted under the IPC and restricted under the UPC
  • Air admittance valve, a one-way vent valve that should seal against gas when flow stops; a failed one leaks

Where this shows up

PlumbingWet venting and common vent guidePlumbingSewer gas odor field guidePlumbingAAV and island vent guidePlumbingDWV venting and pipe sizing guide

Related terms

Trap sealDFUDry ventTrap armWet ventAHJCleanoutDeveloped length

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