FIELD: cleaning inner surfaces of pipes. SUBSTANCE: device has hollow housing with taper head portion which widens in way of motion of working agent. Guide bush is rigidly mounted along axis of housing. Bush contains inner cone which is movable axially. Mills are rigidly secured to head and tail portions of hollow housing. Mills have similar direction of helical lines. Each mill is provided with axial hole which is narrowing in way of motion of working agent. EFFECT: enhanced efficiency. 1 dwg
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