Designed for rapid filtration of particulate matter from HPLC solvents.This unit is excellent value.Protect your instrument and column from costly damage by clarifying all your HPLC solvents and buffer solutions before use.This vacuum filter assembly comes with a sample reservoir and receiving flask.A 47mm diameter membrance filter is placed between the fritted-glass support base and the sample reservior,secured in place by an aluminum clamp.The support base itself is connected to the receiving flask by a vacuum-tight ground-glass joint.Only tow-extractable borosilicate glass and the membrance filter come into contact with the mobile phase.The vacuum hose connection is made above the filtration drip tip to prevent contamination from the vacuum line.