It is Pneumatic Fitting linking pneumatic components. 1. Fast Installation, easy and skillful, saving spaces 2. Diversified types may satisfy the need of any pneumatic pipe arrangement 3. Even after installation, the plastic tube can be freely turned 4. The release ring adopts ellipse design, which makes disassembly more easy 5. All conical tube thread are pre-coated with Teflon leak Proof glue, which secures good sealing performance