All-Glass Filtration Assemblies manufactured by ADVANTEC MFS, Inc. contain a borosilicate glass funnel, sintered glass base, stainless steel screen, or PTFE support and base, anodized aluminum clamp, and receiver flask. The filter funnel mount on filter flask using a ground glass joint. The outlet of the support base drip tube is positioned below the side arm connection to prevent sample aspiration into the vacuum line. All wetted surfaces are borosilicate glass with the exception of the stainless steel and PTFE support options, thereby minimizing contamination of sample or filtrate.