Waterway 218-6610B Diffuser Replacement for Waterway Power Storm Jet Internals This diffuser is designed to use with Waterway regular power storm jet internals It is a diffuser only from the back end of the Waterway power storm jet This is the white plastic back that sometimes fails on the waterway power storm jet This will fit the regular power storm internals It will not fit the power storm II internals which look quite different