If you work with air lines or pneumatic systems, this set of push-to-connect fittings is a total lifesaver. You get 25 pieces total: 5 each of sizes PC4-02, PC6-02, PC8-02, PC10-02, and PC12-02. That covers tube outer diameters from 4mm up to 12mm. One end is the quick-connect tube port, the other is a 1/4-inch G male thread, so you can easily connect tubing to threaded ports. They're made from brass and plastic, feel sturdy, and have a good release cap. They handle a working pressure up to 0.9 MPa (about 130 PSI) and can even go up to 1.32 MPa max. They work with polyethylene, nylon, and PU tubes. Installation is a breeze: cut the tube straight, push it in until it stops (you'll hear/feel a click), and you're done. To disconnect, just press the colored collar in and pull the tube out. They're corrosion-resistant, have good sealing, and make setting up or modifying air lines so much faster than using hose clamps or other fittings. Perfect for DIY projects, workshop air systems, or even some aquarium setups.
