Polaris Zodiac 3900 Gearbox Assembly (39-200) valpakproducts A part like this is

A part like this is useful because it restores the full hydraulic side of the pump in one matched assembly

OEM-quality parts

and this Polaris Zodiac Halcyon version uses the P82 reference

plumbing alignment

and this G & P Tools version is designed for Waterway Quad Flo applications using the WRW4500 reference

Polaris Zodiac 3900 Gearbox Assembly (39-200) valpakproducts A part like this isPolaris Zodiac Gearbox Assy [3900] is a replacement cleaners & parts component for compatible Polaris Zodiac pool cleaner and equipment applications. This part is useful when an original piece is worn, cracked, missing, or no longer holding its proper position during routine pool maintenance. Designed for drive system repair, this component supports the internal drive system that helps the cleaner move correctly across pool surfaces. Replacing small