Use teflon ring to seal joint at screen.
opening in 1 lets atm.
pressure be exerted on liquid.
surface when app.is inverted to filter sample.
flared opening in 2 is used to remove filtrate and to add solvent for second extn. Side outlet in 2 is used to apply rapid short gusts of vac. to remove maximum. amt solvent from samples or to aid in filtration.