Andersen 100 Series Gliding Patio Door Roller Assembly (2009 to March 2010) Unit Number_244DH3440 Andersen M1149 Sash Balancer with

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Andersen 100 Series Gliding Patio Door Roller Assembly (2009 to March 2010) Unit Number_244DH3440 Andersen M1149 Sash Balancer withAndersen 100 Series Gliding Patio Door Roller Assembly (2009 to March 2010) Works with 100 Series Gliding Patio Doors manufactured from 2009 to March 2010 Please note: Most patio sliding glass doors are designed with two roller assemblies, one at each bottom corner of the sliding panel. For the best performance, we HIGHLY RECOMMEND replacing both rollers at the same time to prevent excess strain on a single new roller paired with an older one.