Polaris 3900 Sport Rear Axle Block Assembly | 39-430 Bio-Dex Phosphate Removers It's also the base that

It's also the base that connects and holds the finned disc

The majority of the parts included with this assembly are black except for the restrictor disks which are blue and red

Makes maintenance or replacement easier without system rework

Boost your Style 2 in‑floor pool cleaning system with the Gamma 2 Venturi Pop‑Up Head (SKU 236703) in gray

Polaris 3900 Sport Rear Axle Block Assembly | 39-430 Bio-Dex Phosphate Removers It's also the base thatPolaris 3900 Sport Rear Axle Block Assembly (39 430) The rear axle block assembly is a replacement part made by Polaris for the 3900 Sport. It is also made from the same high grade material used to make the original factory part. Making this a genuine OEM part you can trust. This axle assembly was designed to be one of two axle assemblys needed to house the internal parts as well as external parts that aid in the maneuverability of the cleaner. Such