For positive pressure filtration of materials up to 15 psi. Connection between the funnel and adapter is made by an o-ring joint which permits a larger, grease free opening for sample retrieval. The 24/40 lower inner standard taper joint has an outlet for connection to a vacuum source. Complete item consists of a filter funnel, top inlet adapter, Viton o-ring and a CG-150 stainless steel pinchclamp.