A method of attaching a tubing (36, 38, 40; 62, 64; 102; 154, 184) to a fitting (10, 60, 104, 151) comprising: forming an overmold (48, 80, 100, 150) over an end of the tubing (36, 38, 40; 62, 64; 102; 154, 184), the overmold having an end surface (120, 170); and welding the overmold (48, 80, 100, 150) end surface (120, 170) to an end surface (118, 144, 163) of the fitting (10, 60, 104, 151) allowing for fluid flow through, and fluid contact with said overmold said tubing (36, 38, 40; 62, 64; 102; 154, 184) and fitting (10, 60, 104, 151), said fluid flow being transverse across said fitting end surface (118, 144, 163) and said overmold end surface (120, 170), wherein forming said overmold (48, 80, 100, 150) comprises forming said overmold (48, 80, 100, 150) 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 (48, 80, 100, 150) end surface (120, 170), and wherein welding comprises abutting said overmold end surface (120, 170) to said fitting end surface (118, 144, 163), and wherein said second section defines an inner surface for contacting said fluid flow, wherein forming said overmold (48, 80, 100, 150) 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 (10, 60, 104, 151) 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 (118, 144, 163) 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 (10, 60, 104, 151) and said fitting (10, 60, 104, 151) with molten material molten during said welding. forming an overmold (48, 80, 100, 150) over an end of the tubing (36, 38, 40; 62, 64; 102; 154, 184), the overmold having an end surface (120, 170); and welding the overmold (48, 80, 100, 150) end surface (120, 170) to an end surface (118, 144, 163) of the fitting (10, 60, 104, 151) allowing for fluid flow through, and fluid contact with said overmold said tubing (36, 38, 40; 62, 64; 102; 154, 184) and fitting (10, 60, 104, 151), said fluid flow being transverse across said fitting end surface (118, 144, 163) and said overmold end surface (120, 170), wherein forming said overmold (48, 80, 100, 150) comprises forming said overmold (48, 80, 100, 150) 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 (48, 80, 100, 150) end surface (120, 170), and wherein welding comprises abutting said overmold end surface (120, 170) to said fitting end surface (118, 144, 163), and wherein said second section defines an inner surface for contacting said fluid flow, wherein forming said overmold (48, 80, 100, 150) 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 (10, 60, 104, 151) 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 (118, 144, 163) 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 (10, 60, 104, 151) and said fitting (10, 60, 104, 151) with molten material molten during said welding.