Phase/Fraction Filter Holders manufactured by ADVANTEC MFS, Inc. contain a borosilicate glass funnel, base assembly, anodized aluminum clamp, clip, receiver tube, and silicone stopper No.8(P/FC-1). The 2-way Y bore PTFE valve directs liquid to drain through the main manifold or be diverted to a receiver sample tube. The unit collects aliquots of filtrate during the filtration process for further analysis.