Tube connection fittings

A connection fitting for effecting a connection to a tube, comprising:

• a body member formed with an annular recess extending axially inwardly of one end of the body member to define an inner tubular portion and an outer sleeve portion integrally joined to the tubular portion at its inner end and spaced therefrom at its outer end for receiving an end of the tube to be connected thereby;
• a cap threaded onto said body member and including an end wall formed with an opening circumscribed by a plurality of fingers adapted to engage the end of the tube received within said recess;
• each of said fingers including a flexible juncture to said cap and an axial extension extending inwardly in said space between the inner tubular portion and outer sleeve portion of the body member defined by said annular recess;
• the thickness and diameter of said annular recess throughout its length being at least as large as the thickness and diameter of the tube to be connected thereto;
• the outer end of said annular recess being shaped such that the outer face of said tubular portion of said body member is inwardly stepped, and the inner face of said sleeve portion being inwardly tapered from its outer edge, whereby said outer shaped end of the annular recess is effective, upon receiving the fingers of the threaded cap, to accommodate slightly different-sized tubes within said annular recess, to securely lock the tube within said recess, and to effectively seal the tube within said recess.