Crane Wafer Check Valve

check valve
A valve that closes to prevent backward flow of liquid
A mechanical device in a pipe that permits the flow of water or air in one direction only.
Limits the flow of gas to one direction only. Use a check valve between the bubbler and generator to prevent unwanted pressure build up in the generator, and a safety against a low level bubbler. A check valve, such as used on torches, is recommended.
A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.

crane
Stretch out (one's neck) in this way
Move (a heavy object) with a crane
Stretch out one's neck in order to see something
Grus: a small constellation in the southern hemisphere near Phoenix
United States writer (1871-1900)
stretch (the neck) so as to see better; "The women craned their necks to see the President drive by"

wafer
thin disk of unleavened bread used in a religious service (especially in the celebration of the Eucharist)
Fasten or seal (a letter, document, etc.) with a wafer
a small adhesive disk of paste; used to seal letters
a small thin crisp cake or cookie