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краник для проверки уровня, контрольный краник (Valve used as a backup system of determining water level in a boiler/One of two or more cocks arranged one above the other to ascertain the water level in a steam boiler  merriam-webster.com erodenis) | |||
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| кран для забора проб, водопробный кран (Sloneno4eg) | |||