Try cock

1.A cock for withdrawing a small quantity of liquid, as for testing.
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For example, in addition to the water gauge, a boiler should have 2-4 try cocks to ascertain the boiler water level.
Try cocks (sometimes called gauge cocks) should be opened from time to time to be sure the water level is okay and that the water gauge is working properly.
Try Cocks: Small valves installed on steam boilers at the safe high water level and safe low-water level.