03. The tubing and fittings push-fit together. No tools are required for an airtight connection. To install tubing into fittings, insert the tubing into the fitting until it bottoms; a slight twisting motion will ease insertion. Lightly pull on the tubing to verify it is properly seated in the fitting. They can easily be disconnected by simply pushing in the release ring with one hand and pulling on the tubing with the other. For re-insertion, cut off the marred end of the tubing and repeat the process.