31 and with the end 36 of the middle tube 22 being sealed to laminate 32 the inner tube 24 extends through the aperture 41 in laminate 31 and the end 37 of the inner tube 24 abutting and being sealed to the laminate 33 still referring to fig3 the apertures 40 in the laminate 31 are generally circular in shape but the laminate 31 is notched at one side of each of the apertures 40 to provide a fluid channel 42 that communicates with the reactor formed in the space 25 between the outer and middle tubes 22 23 similarly the aperture 41 in the laminate 32 includes a fluid channel 44 at one side thereof that communicates with the reactor formed in the space 26 between the middle and inner tubes 23 24 the reactor formed in the interior space 27 of the tube 24 is in fluid communication with the aperture 45 in the laminate 33 fluids may be communicated between the other laminates of the end block 13 and the reactor formed in the space 25 through the fluid channels 42 43 and 46 in laminates 31 33 respectively similarly fluids may be communicated with the reactor remaining laminates of the end block 13 and the reactor formed in the space 26 through fluid channels 44 and 47 in laminates 32 and 33 respectively the present embodiment may employee a combination of compression fitting and diffusion bonding to secure and seal tubes 22 24 to endblock 13 as in the following process after endblock 13 has.