Zodiac / Baracuda Alpha 2 Pool Pulse Part Number W44800.  

Pool Pulse is a flow meter that measures
the volume of water running through the cleaner for troubleshooting and setting flow.

This item is used on several different Zodiac Automatic Pool Cleaners. Like the Ranger, Pacer, G3 and G4.

Note: There is a shipping delay of 7 to 10 days before this item ships out.