The existing injection molded part was failing, because the design and molding process caused a high amount of stress in the part. Rotationally molding yields a stress-free part, so it is appropriate for high abuse applications. However, rotational molding can be difficult for designs where different parts need to snap or fit tight together. The inside of the part is untoleranced, and formed features need generous radii for material flow. Since the RTI part needed to fit over the wand squeeze-spout assembly in at least two parts and fit together tightly, traditional rotomolding on its own was a challenge.