Vacuum replacement belt replaces your worn or damaged belt to maintain optimal brush roll performance and maximize carpet cleaning. It is important to check the belt periodically for any signs of wear that can result from normal use over time. The tighter or newer the belt, the better the vacuum will perform. Vacuum replacement belt fits Sanitaire Professional SL4110 series, SL4410 series, 1937T and 1451T upright vacuums (sold separately).