A special tube expanding tool is used for stainless steel single clamp tube fittings at the end of thin-walled stainless steel tube. The tubes are rolled from inside to outside to form a flange ring. Then the tube material is inserted into the tube fittings with socket cone-shaped rubber sealing ring and locking nut. After tightening the nut, the flange ring is used to push the compression cone-shaped rubber sealing ring to play a sealing role.
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