Section P2905 addresses water supply for special fixtures. Hose bibs (outdoor faucets) must have vacuum breakers preventing backflow. Water fountains require separately controlled supply lines. Shower mixing valves are regulated to prevent scald, with thermostatic mixing limiting outlet temperature to 120-130 degrees Fahrenheit. Separate supply piping for toilets and other low-quality water uses permits recycled or non-potable water in some jurisdictions. Irrigation systems must be completely separate from potable water supply with backflow prevention.