Quick-connect fitting

A fitting couplable to an inlet having an inner diameter and an inner surface, the fitting comprising:

• a housing having an end wall and at least one sidewall extending from said end wall to define a cavity in said housing;
• an aperture through said end wall and communicating with said cavity;
• a piston at least partially disposed within said cavity and slidably sealingly engaged with said sidewall to define a variable volume space between said piston and said cavity;
• an elongate mandrel having a first end coupled to said piston and a second end extending through said aperture outwardly of said housing;
• a first stop on said mandrel, said first stop engaging said housing to limit movement of said piston in a direction away from said end wall;
• an axially extending bore through said mandrel, said bore couplable to a source of pressurized fluid;
• and
• at least one resilient bushing disposed on said mandrel;
• the fitting having a first condition wherein said resilient bushing and at least a portion of said mandrel can be inserted within the inner diameter of the inlet, and having a second condition wherein said resilient bushing radially expands to sealingly engage the inner surface of the inlet;
• said mandrel retained within the inner diameter of the inlet solely by said resilient bushing in said second condition, when pressurized fluid is admitted into the inlet through said axial bore.