TL;DR
An angle stop is the small shutoff valve at the wall beneath a sink, toilet, or appliance where the supply stub-out turns 90 degrees to feed the fixture's flexible connector, letting one fixture be isolated without shutting water to the house. Most are 1/2-inch inlet by 3/8-inch compression outlet, in multi-turn or longer-lived quarter-turn ball designs.
What it means
An angle stop is the small shutoff valve at the wall beneath a sink, toilet, or appliance where the supply stub-out turns 90 degrees to feed the fixture's flexible connector, letting one fixture be isolated without shutting water to the house. Most are 1/2-inch inlet by 3/8-inch compression outlet, in multi-turn or longer-lived quarter-turn ball designs. Plumbers replace rather than rebuild them, since a seized or dripping one usually fails exactly when a toilet or faucet swap makes it move for the first time in years. Testing that each turns freely is a two-minute task that prevents flood-while-traveling stories.
Where it sits in the glossary
Angle stop is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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