A method of attaching a tubing (36, 38, 40; 62, 64; 102; 154, 184) to a fitting comprising: forming an overmold over an end of the tubing (36, 38, 40; 62, 64; 102; 154, 184), the overmold having an end surface ; and welding the overmold end surface to an end surface of the fitting allowing for fluid flow through, and fluid contact with said overmold said tubing (36, 38, 40; 62, 64; 102; 154, 184) and fitting , said fluid flow being transverse across said fitting end surface and said overmold end surface , wherein forming said overmold comprises forming said overmold having a first section surrounding an end portion of said tubing (36, 38, 40; 62, 64; 102; 154, 184) and a second section extending from said first section and extending beyond said end portion of said tubing (36, 38, 40; 62, 64; 102; 154, 184) in a direction opposite said tubing (36, 38, 40; 62, 64; 102; 154, 184) to the overmold end surface , and wherein welding comprises abutting said overmold end surface to said fitting end surface , and wherein said second section defines an inner surface for contacting said fluid flow, wherein forming said overmold comprises forming said inner surface to have a first portion having a first diameter and a second portion extending from the first portion to the second section end surface having a second diameter greater than the first diameter, and wherein said fitting comprises an inner surface for contacting said fluid flow, said inner surface having a first portion having a first diameter and a second portion extending from the first portion to the fitting end surface and having a second diameter greater than the fitting inner surface first diameter, and wherein welding comprises filling at least a portion of said second portions of said overmold and said fitting with molten material molten during said welding. forming an overmold over an end of the tubing (36, 38, 40; 62, 64; 102; 154, 184), the overmold having an end surface ; and welding the overmold end surface to an end surface of the fitting allowing for fluid flow through, and fluid contact with said overmold said tubing (36, 38, 40; 62, 64; 102; 154, 184) and fitting , said fluid flow being transverse across said fitting end surface and said overmold end surface , wherein forming said overmold comprises forming said overmold having a first section surrounding an end portion of said tubing (36, 38, 40; 62, 64; 102; 154, 184) and a second section extending from said first section and extending beyond said end portion of said tubing (36, 38, 40; 62, 64; 102; 154, 184) in a direction opposite said tubing (36, 38, 40; 62, 64; 102; 154, 184) to the overmold end surface , and wherein welding comprises abutting said overmold end surface to said fitting end surface , and wherein said second section defines an inner surface for contacting said fluid flow, wherein forming said overmold comprises forming said inner surface to have a first portion having a first diameter and a second portion extending from the first portion to the second section end surface having a second diameter greater than the first diameter, and wherein said fitting comprises an inner surface for contacting said fluid flow, said inner surface having a first portion having a first diameter and a second portion extending from the first portion to the fitting end surface and having a second diameter greater than the fitting inner surface first diameter, and wherein welding comprises filling at least a portion of said second portions of said overmold and said fitting with molten material molten during said welding. <EOS>