There are various connection methods for stainless steel pipes. Common types of pipe fittings are compression type, compression type, union type, push type, push thread type, socket welding type, union flange connection, welding type and welding. Combined derivation series connection. These connection methods have different application scopes according to different principles, but most of them are easy to install, firm and reliable. The material of the sealing ring or gasket used for the connection is mostly selected from silicone rubber, nitrile rubber, and ethylene-propylene-diene rubber that meet the requirements of national standards, eliminating the user's worries.