A plumbing connector comprising: a fitting having a first end and a second end and having external threads on at least the first end ; a tube having a first end and a second end , the first end of the tube inserted into the first end of the fitting ; an annular gasket coaxial with and surrounding an outer diameter of the tube and adjacent the first end of the fitting ; a compression ring coaxial with and surrounding the outer diameter of the tube and adjacent the gasket , the compression ring having an inner edge and an outer edge ; and a lock ring coaxial with and surrounding the outer diameter of the tube and adjacent the compression ring , the lock ring having an inner edge and an outer edge ; a nut coaxial with and surrounding an outer diameter of the tube and having internal threads adapted to engage the external threads of the fitting , the nut adapted to contain the gasket , compression ring , and lock ring upon threading of the nut onto the fitting via the internal threads of the nut and the external threads of the fitting , wherein, upon threading of the nut onto the fitting via the internal threads of the nut and the external threads of the fitting and tightening of the nut , the gasket is compressed, the inner edge of the lock ring bitingly engages the outer diameter of the tube , and the gasket forms a seal with at least the first end of the fitting , the outer diameter of the tube , and the outer edge of the lock ring , wherein the gasket , the compression ring , the lock ring , and the nut are located on the tube in the following order starting from the first end of the tube : the gasket , the compression ring , the lock ring , and the nut , wherein a friction ring is placed between the gasket and the compression ring , and wherein the friction ring has an outer diameter smaller than an outer diameter of the lock ring . a fitting having a first end and a second end and having external threads on at least the first end ; a tube having a first end and a second end , the first end of the tube inserted into the first end of the fitting ; an annular gasket coaxial with and surrounding an outer diameter of the tube and adjacent the first end of the fitting ; a compression ring coaxial with and surrounding the outer diameter of the tube and adjacent the gasket , the compression ring having an inner edge and an outer edge ; and a lock ring coaxial with and surrounding the outer diameter of the tube and adjacent the compression ring , the lock ring having an inner edge and an outer edge ; a nut coaxial with and surrounding an outer diameter of the tube and having internal threads adapted to engage the external threads of the fitting , the nut adapted to contain the gasket , compression ring , and lock ring upon threading of the nut onto the fitting via the internal threads of the nut and the external threads of the fitting , wherein, upon threading of the nut onto the fitting via the internal threads of the nut and the external threads of the fitting and tightening of the nut , the gasket is compressed, the inner edge of the lock ring bitingly engages the outer diameter of the tube , and the gasket forms a seal with at least the first end of the fitting , the outer diameter of the tube , and the outer edge of the lock ring , wherein the gasket , the compression ring , the lock ring , and the nut are located on the tube in the following order starting from the first end of the tube : the gasket , the compression ring , the lock ring , and the nut , wherein a friction ring is placed between the gasket and the compression ring , and wherein the friction ring has an outer diameter smaller than an outer diameter of the lock ring . <EOS>