Pet cock


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(Mach.) A little faucet in a water pipe or pump, to let air out, or at the end of a steam cylinder, to drain it.

See also: pet

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in classic literature ?
The birds that the two girls had brought in were duly returned to the yard, and the process was repeated till all the pet cocks and hens had been submitted to the old woman--Hamburghs, Bantams, Cochins, Brahmas, Dorkings, and such other sorts as were in fashion just then--her perception of each visitor being seldom at fault as she received the bird upon her knees.
KARACHI -- Five ships, MSC Beijing, Zhong YU-89, SKY Ploeg, Caspian Gas and White Purl carrying Containers, Pet Cock, Palm oil and LPG were arranged berthing at Qasim International Container Terminal, Pakistan International Bulk Terminal, Liquid Cargo Terminal, SSGC Terminal and Engro Vopak Terminal respectively on Monday.
Berth occupancy was 55% at the port on Friday where six ships namely MSC Busan, Ikan Siakap, Super Star, Al Soor II, Ex Quisite and Donga Chronos are currently occupying berths to load/offload Containers, Pet Cock, Soya Been, diesel Oil, LNG and Edible Oil respectively during last 24 hours.