Precision stainless steel ferrule connectors mainly include ferrule-type straight-through pipe joints, ferrule-type end straight-through connectors and ferrule-type three-way pipe joints. Even if it is a batch of goods from the same manufacturer, the depth of the taper holes on these types of joints is often different, which will cause leakage. This problem is often ignored. The correct way is to connect one end of the pipeline with what kind of joint body, corresponding to The connection end is pre-installed with the same type of joint to avoid leakage problems as much as possible. To improve the maintainability of precision stainless steel ferrules and new specifications and requirements for ferrule fittings, the seals of ferrule fittings are designed to be removable and replaceable.