Photo of a typical pressure regulator on a late-model (ca. 2007) North American water heater. Visible are:

1. the temperature-setting ( thermostat) dial on the front (marked Hot/Warm/Vaction)
2. the main off/pilot/on valve, on top (currently "on")
3. the pilot light override pushbotton, immediately to the left of the off/pilot/on valve
4. the button for the piezoelectric igniter, mounted on the right side of the regulator

The black pipe entering at the left is the gas supply. The four tubes/wires leading down are (from left to right): the pilot light sensor (thermocouple); the main burner gas line; the pilot light gas line; and the piezoelectric igniter wire.

See also Image:Gas supply line trap.JPG.

I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. If this is not legally possible: I grant any entity the right to use this work for any purpose, without any conditions, unless such conditions are required by law. PD Public domain false false

This file is a candidate to be copied to Wikimedia Commons. Any user may perform this transfer; refer to Wikipedia:Moving files to Commons for details. If this file has problems with attribution, copyright, or is otherwise ineligible for Commons, then remove this tag and DO NOT transfer it; repeat violators may be blocked from editing. Other Instructions Endorse this file for transfer by adding |human=<your username> to this Template. If this file is freely licensed, but otherwise unsuitable for Commons (e.g. out of Commons' scope, still copyrighted in the US), then replace this Template with {{ Do not move to Commons|reason=<Why it can't be moved>}} If you think that a local copy of this file should be retained, then replace this Template with {{ Keep local|reason=<Why a local copy is needed>}} Please ensure that the file has a properly descriptive and unambiguous name before transferring; see Wikipedia:File mover#What files should be renamed? for details.

This file was suggested for transfer by a bot ( User:Fbot). Please verify that this file is suitable for Commons before transferring it.

This media file is either in the public domain or published under a free license, and contains no inbound file links. If this media file is useful, then it should be transferred to the Wikimedia Commons. If this media is not useful, then please propose it for deletion or list it at files for discussion.