An adaptor for an endoscopic device includes (a) a cylindrical core extending from a first end to a second end along a central axis and (b) a collar slidably received over the core. The second end includes first and second slots defining first and second arms which radially expandable toward the axis and away from the axis. The second end is sized and dimensioned to engage an end of a first conduit of a biopsy device. The collar extendes from a first end to a second end and being movable from a first position in which the second end of the collar is axially separated from the arms and a second position in which a portion of the collar is positioned over the arms radially compressing the arms to lockingly grasp a free end of a first conduit positioned therebetween to create a fluid-tight seal about the first conduit.
