A sprinkler assembly comprising: a fire protection sprinkler having a body defining an inlet and an outlet with a passageway extending between the inlet and the outlet along a longitudinal axis (A-A), a deflector supported by the body and spaced from the outlet, the body having an outer encasing surface surrounding at least a portion of the passageway having an axial length in the direction of the longitudinal axis (A-A) to define a first contact zone; an escutcheon having a receiver and a rim surrounding the fire protection sprinkler to define an aperture (A-A) between the receiver and the sprinkler, the receiver having a surface defining a second contact zone; and a push-to-connect fitting including: a tubular member with an end for connection to a pipe, the tubular member including an exterior surface and an inner surface, the inner surface defining an internal conduit that receives the body of the sprinkler; a seal member and a retaining ring disposed within the internal conduit, the seal member forming a fluid tight seal about the first contact zone with the retaining ring engaged in a grip about the first contact zone to form an adjustable seal and grip about the outer encasing surface of the body of the sprinkler along the first contact zone; and a releasing member that translates with respect to the tubular member to disengage the grip of the retaining ring (150 about the first contact zone, the second contact zone of the escutcheon translating with respect to the tubular member to define an adjustable deflector-to-rim distance between the rim of the escutcheon and the deflector of the sprinkler. a fire protection sprinkler having a body defining an inlet and an outlet with a passageway extending between the inlet and the outlet along a longitudinal axis (A-A), a deflector supported by the body and spaced from the outlet, the body having an outer encasing surface surrounding at least a portion of the passageway having an axial length in the direction of the longitudinal axis (A-A) to define a first contact zone; an escutcheon having a receiver and a rim surrounding the fire protection sprinkler to define an aperture (A-A) between the receiver and the sprinkler, the receiver having a surface defining a second contact zone; and a push-to-connect fitting including: a tubular member with an end for connection to a pipe, the tubular member including an exterior surface and an inner surface, the inner surface defining an internal conduit that receives the body of the sprinkler; a seal member and a retaining ring disposed within the internal conduit, the seal member forming a fluid tight seal about the first contact zone with the retaining ring engaged in a grip about the first contact zone to form an adjustable seal and grip about the outer encasing surface of the body of the sprinkler along the first contact zone; and a releasing member that translates with respect to the tubular member to disengage the grip of the retaining ring (150 about the first contact zone, the second contact zone of the escutcheon translating with respect to the tubular member to define an adjustable deflector-to-rim distance between the rim of the escutcheon and the deflector of the sprinkler. a tubular member with an end for connection to a pipe, the tubular member including an exterior surface and an inner surface, the inner surface defining an internal conduit that receives the body of the sprinkler; a seal member and a retaining ring disposed within the internal conduit, the seal member forming a fluid tight seal about the first contact zone with the retaining ring engaged in a grip about the first contact zone to form an adjustable seal and grip about the outer encasing surface of the body of the sprinkler along the first contact zone; and a releasing member that translates with respect to the tubular member to disengage the grip of the retaining ring (150 about the first contact zone, the second contact zone of the escutcheon translating with respect to the tubular member to define an adjustable deflector-to-rim distance between the rim of the escutcheon and the deflector of the sprinkler.