Four port manifold with 2mm bore glass stopcocks on the ports. A "T"-bore stopcock is located 100mm from the end of the manifold and 40mm from the first port. The distance between the other 3 ports is 50mm with the last port being 75mm from the opposite end of the manifold. The entire manifold is constructed of capillary tubing having an O.D. of 8mm and an I.D. of 2mm.