Abstract: A fluid adaptor includes a flexible, funnel-shaped body having a wide first opening and a narrow second opening. The inner surface of the body features a series of annular protrusions. These protrusions have diameters that progressively decrease from the wide opening toward the narrow opening. This stepped internal structure allows the adaptor to form a secure, frictional seal with container openings of various sizes without an external clamp. An extension tube may be connected to the narrow opening to lengthen the fluid pathway.

Abstract: A fluid adaptor, having a funnel adaptor having a first open end and a second open end, the first open end having a greater diameter than the second open end, a plurality of annular protrusions disposed on an inner surface of the funnel adaptor and arranged between the first open end and the second open end, each of the plurality of annular protrusions having a radius, the radii decreasing from the first open end to the second open end, and an extension tube extending from and integral to the second open end. In some possible configurations of the funnel adaptor, an elongated tube may removably and frictionally engage the second open end. In other possible configurations, each adjacent pair of the plurality of annular protrusions forms an annular channel therebetween.

Abstract: A fluid adaptor, comprising a funnel adaptor having a first open end and a second open end, the first open end having a greater diameter than the second open end, a plurality of annular protrusions disposed on an inner surface of the funnel adaptor and arranged between the first open end and the second open end, each of the plurality of annular protrusions having a radius, the radii decreasing from the first open end to the second open end, and an extension tube extending from and integral to the second open end. In some embodiments of the funnel adaptor, an elongated tube may removably and frictionally engage the second open end. In other embodiments, each adjacent pair of the plurality of annular protrusions forms an annular channel therebetween.