Buchner Funnel, Table Top, Polyethylene, Porous, 18in ID, Coarse Porosity, Removable Plate. Filter large volumes quickly with a polyethylene table-top buchner funnel using your choice of filter plate. Removable hose barb connector accepts 12.7mm (1/2") I.D. tube and threads into 3/4" NPT bung on the funnel. Filter plates are supported by a multiple ring grid; HDPE, 6.4mm (1/4") thick, with a non-porous ring at the periphery of the plate which seals filter paper when used with porous filter plates. Coarse porosity is 90-130 microns; use temperature range maximum 52ºC (125ºF), minimum -20ºC (-4ºF).