The glass support disc can be replaced if it becomes clogged or if sample-to-sample contamination is a concern Like the apparatus with fritted glass support, the ground joint connection eliminates the possibility of phthalate contamination that can occur when using silicone or neoprene stoppers Each apparatus is supplied with 1000mL funnel, 90mm glass support base, 40-60 micron porosity fritted glass disc, anodized aluminum clamp and filtration flask Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements