punch indicated generally at 50 second hollow punch 50 is similar to 40 but with a hexagonal concavity 52 this serves to extrude the dome shaped preform 48 into a matching shaped hollow hexagonal line connector 54 connector 54 is totally integral to the upper end of the now completed manifold which indicated generally at 56 the interior of line connector 54 may be threaded by conventional means as a last step referring next to fig7 and 8 the hollow central pin 30 at the bottom of completed manifold 56 and the line connector 54 are both seamless and leak tight as well as being integrated to the part the only potential leak paths would be the braze seams between the slots 36 and the flow tubes 12 and the threaded connection between the line connector 54 and the system line which can 39 t be eliminated the pin 30 is also the proper size to be inserted into the resilient pad 16 as well as providing an end closure in an alternative embodiment of a manifold produced according to the invention indicated generally at 58 most features such as the central pin and the tube slots are common and are given the same number with a prime 39 in addition however the unslotted upper portion has been left longer and.