A self-locking universal coupling is designed to do more than simply connect two pipe ends. In addition to creating a watertight seal, its mechanical gripping or locking structure helps restrain axial pipe movement and reduce the risk of pipe pull-out under operating pressure.

Compare PN10 vs PN16 universal pipe couplings. Learn how working pressure, surge pressure, pipe material, temperature and application affect pressure rating selection.

Learn how a self-locking universal coupling uses grip elements, gasket compression and axial restraint to prevent pipe pull-out under pressure.

A self-locking universal coupling​ is designed to connect plain-ended pipes while also helping restrain axial movement. Compared with a conventional universal coupling, the self-locking design provides an additional gripping function that helps keep the connected pipes from separating under internal pressure or external movement.

The first selection parameter is the nominal diameter, normally expressed as DN. For example, a DN300 dismantling joint is generally intended for a DN300 pipeline, valve, pump, or other flanged component.

A typical Gibault joint consists of a center sleeve, two end rings or glands, rubber sealing rings, bolts and nuts. When the bolts are tightened, the end rings move toward the center sleeve and compress the rubber gaskets against the outside surface of the pipe.