An enteral feeding apparatus has a pump system including a bearing surface, a platen and a retainer mounted on the platen. The retainer has a first engagement member. A feeding set includes a cassette and a lumen attached to the cassette. The lumen has a peristalsis loop for extending around the bearing surface and the cassette has a second engagement member adapted for engagement with the first engagement member of the retainer to thereby secure the cassette to the pump system. The lumen is in tension when the peristalsis loop is extended around the bearing surface and the first and second engagement members are engaged. The second engagement member of the cassette is biased into engagement with the first engagement member of the retainer by the tension on the lumen.
