FIELD: technological processes.
SUBSTANCE: filter cell for mounting in the adapter assembly of the filter cell with a key retractable security element for closing the external thread is configured to receive the filter cell. The filter cell comprises an end cap with one or more key protrusions projecting axially and radially from it to enter the adherence the key channels on the retracted security element.
EFFECT: invention provides a filter equipped with a key tool to accept only allowed filters.
30 cl, 12 dwg
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