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The leather cup is designs the trap application the synthesis product which strengthens by the textile fiber cloth, side the guidance is specially to resist the pipeline pressure to play the rigid bracing role to use the textile fiber cloth to strngthen, three jiao parts are to realize in the tube to seal, but is the prue oil resistant rubber makes elastically, the seating cup base inlays has the packing ring, when the leather cup installs after the movable support, the cup leather packing seals up sels on the caulking the bolt hole.