Polaris 3900 Sport Bottom Housing | 39-004 Bio-Dex Algaecide and the larger locking tab

and the larger locking tab provides a tighter fit and smoother operation

Before replacing the head

Caretaker 5-Port Top Housing for 1

This would normally cause the cleaner to be hung up or impeded

Polaris 3900 Sport Bottom Housing | 39-004 Bio-Dex Algaecide and the larger locking tabPolaris 3900 Sport Bottom Housing (39 004) The bottom housing is a replacement part made by Polaris. The same high grade plastic material was used to make the original factory part. Making this a genuine OEM product. This bottom housing was designed to be the housing unit for all of the internal parts. They give the cleaner its power and ability to clean the dirt, debris, and other forms of mulch off the surface of your pool. leaving behind a crystal