1) Locomotive part
Found on
https://www.crosswordclues.com/clue/snifting-valve
A snifting valve (sometimes snifter valve) is an automatic anti-vacuum valve used in a steam locomotive when coasting. The word Snift imitates the sound made by the valve. ==Overview== When the driver shuts off the steam to the cylinders of a steam locomotive while it is in motion, the moving pistons could create a partial vacuum in the cylinders....
Found on
http://en.wikipedia.org/wiki/Snifting_valve
No exact match found.
