Bob from SWISCO responded:
June 5, 2020
Thanks for posting. This looks like either a 39-253LB or 39-438B. The key difference between these two operators are the appendages at the end of the straight arm. The 39-253LB uses a square track slider sold separately, our 39-529, while the 39-438B uses a rectangular black slider that comes built-in to the straight arm. This slight difference effects window compatibility, so be sure to confirm what you have. |