This counterintuitive bit of secret knowledge might be the result of the sheer weirdness of plumbing fittings in general ...

Pneumatic fittings are parts used to connect sections of pipe, tube, and hose in pneumatic (pressurized ... Some ball and sleeve fittings function as push-to-connect fittings which are convenient for ...

For more information on flanges, visit the Pipe Flanges Selection Guide on GlobalSpec. Push-to-connect fittings have ends that are designed to accept tubing by pushing it into the end. These fittings ...