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【GOOD SEALING】All thread are Teflon Coated. Please use straight cut tubing before inserting into the fitting. 【IT IS EASY TO USE】It is easy to insert or pull the trachea by hand without the aid of a tool. 【MATTERS NEED ATTENTION】 1.Please do not use it for purposes other than fluids. 2.Please do not exceed the maximum use pressure when using. 3.After the pipe is connected and installed, pull the pipe to make sure that the pipe cannot pull out the joint. 4.Do not use outside the service temperature range to prevent deformation of the sealing material and easy leakage. 5.Do not use it in places where metal powder or sand dust is mixed, such as adhesion of other materials may cause poor work or leakage. 6.When inserting the pipe, it must be inserted into the bottom of the joint. Failure to insert the pipe into the bottom may lead to air leakage.7.Make sure that the cutting surface of the pipe is vertical, there is no scar on the outer circumference of the pipe and the pipe is not oval. Also available in the following size (please see corresponding ASIN): 5/16 od Pu Tube: B07RM5WWBT