Unions and plugs made of extruded brass.
Elbows and tees made of forged brass.
Adequate to be used with plastic tubes (nylon, polyethylene, polyurethane), used in air braking systems for trucks.
No tools required just push the inside the connector. To release 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.