Grey colour outer plastic tube, the inner part is white plastic tube octagonal shape 2/1 or 3/1 or 3,5/1,8 size. Armored with steel wire 0,8 mmdia, with brass coupler M2 (for size 3/2), M3 (for size 4/3). The size 4,8/3,5 has the special steel threaded coupler M2.
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