Push-in fittings allow the quick connection of tube, a simple locking
ring within the fitting secures the tube, and the seal is made against
an 'O' ring.
Wade push-in fittings are very flexible, with special features such
as swivel fittings which allow the body of the fitting to be pointed in
the direction required after the fitting has been secured. Internal
hexagons appear on many stud couplings, which allow the fittings to be
used in small spaces.