The push in fitting have a circular drectional type collar which locks on to the outside of the tube providing retention. Imagine hose barb or fitting on your garden hose. An o-ring then nprovides the sealing.
The screw in fittings have a brass collar known as an olive which is compressed onto the tube by the threaded nut to provide retention and again an o-ring for sealing.
The push in fittings recommend the trimming of the tube to remove the distorted part of the tube caused by the original compression of the olive. This then gives a smooth round area for the retention collar to lock onto and the o-ring to seal against.
Trim only what is needed.
cheers



Reply With Quote



Bookmarks