Polaris Zodiac 3900 Chain Tensioner (39-120) hydrodynamic or inconsistent in feel

or inconsistent in feel

Useful for repair and visible fitting refresh work

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

This part has practical value because a properly fitted handle float helps preserve the intended balance and support characteristics of the cleaner assembly

Designed for E4 Value Bath panel layouts

Polaris Zodiac 3900 Chain Tensioner (39-120) hydrodynamic or inconsistent in feelPolaris 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