Does UPC 2015 allow hose connections below grade (e.g. in an underground valve box)? Is a regular vacuum breaker sufficient in this situation or is a double check valve needed (typical for sprinklers)?
603.5.17 Potable Water Outlets And Valves. Potable water outlets, freeze-proof yard hydrants, combination stop-and-waste valves, or other fixtures that incorporate a stop and waste feature that drains into the ground shall not be installed underground. A vacuum breaker is not considered a "stop and waste feature" correct?
Related question regarding yard hydrants, which would be an alternative if I can't put a hose connection under ground. Per Table 603.2 "Freeze resistant sanitary yard hydrants" "Such devices are not for use under continuous pressure conditions."
Does this mean a valve is required a before a yard hydrant? i.e. when you close the valve on a hose bib "hose connection vacuum breaker" is no longer subject to operating pressure, however the "freeze resistant sanitary yard hydrant" assembly as a whole technically remains under pressure when you shut off the yard hydrant.