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CP | Cathodic Protection | Water, Gas, Oil, Fuel | Indicates nearby cathodic protection on a pipe. This protects a metal pipeline from corrosion caused by electrical currents. For short pipelines with a low diameter this might be a sacrificial anode. For larger and longer pipelines this will be a DC cathodic protection current applied to the pipeline. |
| WO | Wash Out | Water | Valve opened to clear our sediment buildup in a pipeline. Consumers with a portable water meter can attach to these to make use of the water. An operator of a vacuum tanker vehicle might use one of these. It is generally prohibited to connect a portable water meter to a water hydrant, as these are reserved for emergency use. | |
| SV | Sluice Valve | Water | Value used to isolate sections of pipe. | |
| ZV | Zone Valve | Water | Valve used to isolate a zone area. | |
| H | Hydrant | Water | Water hydrant for fire fighting. These are generally reserved for emergency use only. | |
| AV | Air Valve | Water | Automatically purges air buildup in a pipeline. Usually installed at high points along the pipeline. |