These over size enema tips are definitely for someone special. They come in two styles, four sizes each style.
The KP style has a bulbous head that necks down sharply. This style of enema tip will be jarring upon insertion and have a ruder feel than the KB style. An advantage is that once inserted, there will be a fairly good seal on the anus. The sharp neck down will make expulsion of the enema tip less likely.