Feature: 1. 5 SETS FITTINGS: Including 5pcs quick connectors and 5pcs locks, sufficient quantity for easy connection and replacement. 2. PLASTIC STEEL: Made of excellent plastic steel material, has good rigidity, aging and corrosion resistance, and not easy to rust. 3. TIGHT THREAD: These self locking air fittings have tight thread structure that is clear and wear resistant and not prone to cracking. 4. STEEL BALLS: Built in high hardness steel balls, with tight and smooth buckle, and the operation is convenient and reliable. 5. STANDARD SIZE: Maximum pressure resistance up to 20kgf/cm², wide range of applications, suitable for standard inner diameter hoses. Specification: Item Type: Quick Connector Material: Plastic Steel Maximum Pressure Resistance: 20kgf/cm² Working Pressure: 0~0.92kgf/cm² Operating Temperature: -35℃~60℃. Package List: 5 x Connectors5 x Locks Note: 1. During the use of the connector, please do not pull out and insert the hose frequently, which will affect the service life of the connector and the hose.2. When the pipe is inserted into the connector, it needs to be inserted into the bottom of the connector to avoid the possibility of air leakage.3. When pulling out the hose, first confirm that there is no pressure in the tube, press the end cap of the connector to the end and pull out the hose.