FIELD: treatment, mainly, of non-metallic materials. SUBSTANCE: apparatus has a sealing member in the form of an elastic collar with a cone annular slit, into which a wedge- shaped metallic washer is inserted. Such structure of the collar provides lowered mass of the apparatus and its enhanced reliability due to self-adjustment of an effort of the collar forcing towards a plunger by the liquid pressure. EFFECT: lowered mass, enhanced reliability of the apparatus. 2 cl, 3 dwg
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