A heat exchanger 10 including a plate pair having first and second plates 42, 44 each having an outward depression 46, 50 extending to a peripheral edge thereof, the first and second plates 42, 44 defining a fluid channel 12 therebetween and secured to one another with the outward depressions 46, 50 defining flow openings 58, 60 in communication with the fluid channel 12. An outer flange 61 extends substantially around a periphery of the flow opening 58, 60. A tubular fitting 70 with a first end 82 and an outer surface 74 having an annular flange 76 thereon spaced apart from the first end 82 is secured to the plate pair with the first end 82 received within the flow opening 58, 60 and the annular flange 76 abutting against the outer flange 61.