Polaris Zodiac 3900 Chain Tensioner (39-120) hydrodynamic helping protect internal components while

helping protect internal components while also contributing to the unit’s overall shape and water-handling behavior

Useful for repair and visible fitting refresh work

and this 4

A valve body assembly helps form the main housing structure of a compatible multiport valve

Polaris Zodiac 3900 Chain Tensioner (39-120) hydrodynamic helping protect internal components whilePolaris Zodiac Chain Tensioner [3900] is a replacement part for compatible Polaris and Zodiac pool cleaner systems. This component helps keep the drive chain properly positioned so the cleaner can maintain steady movement during normal operation. When small cleaner parts wear out, even minor fit or movement issues can reduce cleaning coverage, create leaks, or cause the cleaner to move less reliably. Use part number 39 120 to help match this item to