Unions and plugs made of extruded brass (CLA 360).
Elbows and tees made of forged brass ( CLA 377).
Adequate to be used with plastic tubes (nylon, polyethylene, polyurethane), used in air braking systems for trucks.
No tools required just push the tube inside the connector. To elease hold the milled sleeve and pull the tube. These connectors have no plastic parts and the stroger the traction of the tubing the better for mounting.