Polaris Pool Cleaner 3900 Automatic Swimming Sport Tune Up Rebuild Kit R0543200<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>New Polaris R0543200 3900 Tune-Up Kit</li><li>Chain guard: Acts as a guide to ensure the drive chain is always aligned on the drive pulley</li><li>Redesigned tensioner pulley &amp; spring: Keeps chain engaged with wheel sprockets to maximize torque transfer</li><li>Gear box upgrade: Bearing shield incorporated for superior cleaning， durability， extended lifespan， and improved longevity</li><li>8-point mechanical upgrade: Provides strength， durability， and ad hassle-free experience.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51AMNybotwL.jpg" noproxy>