Device passport 05
The small fitting on an outdoor faucet is a hose-bib vacuum breaker
Identify the threaded hose-connection device, understand its drain and anti-siphon function, and avoid damaging a non-removable model.
A hose-bib vacuum breaker protects against backsiphonage at a hose connection. Brief drainage after shutoff differs from continuous leaking or a damaged diaphragm.
Do not defeat a break-away set screw or remove a non-removable device without confirming the faucet and local requirement.
Interactive check
Turn observations into a next step
This narrows the route. It does not replace an on-site test, manufacturer instructions, or local requirements.
Evidence sequence
Move in this order
- 01
Confirm the fitting
Look for hose threads, vent openings, brand, and a set-screw location.
- 02
Observe on and off cycles
Separate shutoff drainage from continuous pressurized leakage.
- 03
Match the replacement
Use the correct thread, pressure use, approval, and drain feature.
Identification notes
What to look for
- Female hose thread attaches to the faucet; male hose thread accepts the hose.
- Small side or bottom openings can drain when pressure changes.
- Some models use a break-away screw to become non-removable.
Safe observations
What you can check without taking it apart
- Remove the hose and observe the faucet attachment.
- Check for visible mineral debris.
- Photograph the set screw before any work.
Stop conditions
Move to qualified help when
- The device is seized and the faucet piping twists
- Continuous uncontrolled flow
- Freeze-split faucet or wall hydrant
- Local rules are unknown
Boundary check
Do not confuse this path with
- A PVB is a larger raised assembly with test cocks.
- An AVB is installed in piping rather than on hose threads.
- A pressure regulator has no atmospheric drain openings.
Official local layer
Your utility sets the rule
Product instructions and local inspection requirements determine whether a hose-connection device may be removed or replaced.
Evidence ledger
What this decision path is built on
Product instructions and local inspection requirements determine whether a hose-connection device may be removed or replaced.
- 01U.S. EPA · EPA-CCC-001Cross-Connection Control ManualBackflow, backsiphonage, device families, hazard protection, testing, and program responsibility. Verified 2026-08-02.
- 02Watts · WATTS-HOSE-008Series 8 hose connection vacuum breakerHose-thread device identification, backsiphonage protection, and service literature. Verified 2026-08-02.
Continue the case
Related next steps
CONTENT REVIEWED · 2026-08-02