A cassette for use in dispensing a pleated tubing to collect waste material is formed of an annular body having a U-shaped cross-section in which is packed the pleated tubing in layered form and of an annular flange which extends over the housing. The flange has an inner portion that extends downwardly to engage the upper part of the inner wall of the annular body and an outwardly projecting portion that extends over the housing. The outwardly projecting portion has an annular funnel area to assist in the sliding of the pleated tubing when pulled through the central core of the annular body.