The Hydro-Photon FAF-ADP prefilter fits the following water bottles
The SteriPEN Pre-Filter- Narrow and Wide-Mouth Bottles fits many commercial water bottles, including narrow-mouth and wide-mouth bottles. This SteriPEN wide bottle filter, also known as the FitsAll Filter, features a 40x40 micron screen that removes particulates and debris from your drinking water prior to purification with a SteriPEN UV pen. This travel water filter is made from durable and flexible construction material that is portable.
SteriPEN Pre-Filter- Narrow and Wide-Mouth Bottles specifications:
The FitsAll Filter cup also serves as an adapter that allows the SteriPEN Journey or Classic to be used with these wide-mouth water bottles in the inverted position.