What is a hose bib?
A hose bib is an outdoor faucet for connecting a garden hose. Some have a built-in vacuum breaker that admits air to stop water flowing back toward the supply. Include service isolation in replacement plans: WSSC Water’s local amendment to IPC Section 606.2 explicitly includes frost-proof devices in its shutoff requirement.
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- Photograph the hose outlet: show any small air-inlet holes around the connection or a round cap covering the inlet. Source: City of Ames, Iowa, read 2026-11-03.
- Before freezing weather, if the outside faucet has a separate indoor valve, close that valve, remove the hose and drain the faucet. Source: Greater Cincinnati Water Works, read 2026-11-03.
- For work under WSSC’s cited guidance, request a written scope identifying the hose-bib supply shutoff and stating whether the work includes it. Source: WSSC Water, read 2026-11-03.
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How do I know if my hose bib has a vacuum breaker?
Look at the outlet before planning an upgrade: Ames describes two visible clues for the backflow attachment. “Hose bib vacuum breakers will have either a series of small holes around the threads where the hose connects or a round cap covering up the air inlet.” Source: City of Ames, Iowa, read 2026-11-03.
Why are garden hoses a concern at a hose bib?
The concern is water returning toward the house during a pressure loss while a connected hose is in use. “Backflow can occur when there is a sudden drop in the water pressure.” Source: City of Ames, Iowa, read 2026-11-03. “Imagine what could be siphoned back into the plumbing system in your house if water pressure was lost while the hose was being used.” Source: City of Ames, Iowa, read 2026-11-03.
How do I winterize my outdoor hose bibb faucets?
For cold weather, Greater Cincinnati Water Works separates its advice according to whether the outdoor line has indoor isolation. “If you have a separate valve for outside faucets, close the valve, remove hoses and drain the faucet.” Source: Greater Cincinnati Water Works, read 2026-11-03. “If you don't have a separate valve, wrap the outside faucets (hose bibs) in newspapers or rags covered with plastic.” Source: Greater Cincinnati Water Works, read 2026-11-03.
Are you expected to replace the hose bib and vacuum breaker as a unit when either one fails?
Not necessarily: Ames describes a removable attachment, so distinguish replacing that part from changing the entire outdoor faucet. “It is not necessary to replace the hose bib to install a vacuum breaker.” Source: City of Ames, Iowa, read 2026-11-03. “The vacuum breaker can still be removed if it needs to be replaced.” Source: City of Ames, Iowa, read 2026-11-03.
What should I check before buying a new hose-bib faucet?
For homes under WSSC Water’s 2018 code guidance, check service isolation against IPC Section 606.2 and drain-down provisions where freezing applies. “A shutoff valve is required for each individual water supply to sillcocks, hose bibbs, wall or yard hydrants, irrigation supplies, decorative fountains or general water outlets.” Source: WSSC Water, read 2026-11-03. “This includes "frost-free" or "frost-proof" type devices.” Source: WSSC Water, read 2026-11-03. “If the water supply is subject to freezing, the piping arrangements shall include a means to drain water piping at all low points and a means to relieve any vacuum to enable drain down.” Source: WSSC Water, read 2026-11-03. “A shutoff valve with bleed/drain port is an acceptable method to relieve vacuum.” Source: WSSC Water, read 2026-11-03.
Sources
- Backflow Prevention in the Home — City of Ames, Iowa; read 2026-11-03.
- Frozen Pipes — Greater Cincinnati Water Works; read 2026-11-03.
- Guide to Code Consistency for 2018 WSSC Plumbing and Fuel Gas Code: hose-bib shutoffs — WSSC Water; published 2021-04-01; read 2026-11-03.