Polaris Chain Tensioner Kit — Part # 39-120 Edit leaks typically appear between the

leaks typically appear between the pump housing and motor—often mistaken for housing cracks or gasket issues

and organic material stay captured as the rake is lifted

and compatibility

Common signs may include no valve movement

Polaris Chain Tensioner Kit — Part # 39-120 Edit leaks typically appear between theKey Benefits + Pool Cleaner Drive Fitment Genuine Polaris chain tensioner kit for the Polaris 3900 Sport pressure side pool cleaner Part number 39 120 helps customers match the correct replacement component Helps maintain proper chain tension inside the cleaner drive system Supports smoother cleaner movement when the original tensioner is worn or failed Helps prevent the cleaner chain from becoming loose, slipping, or misaligned Useful replacement