Casement window operator

Thanks for reaching out! Your window operator should only have two arms, a long straight arm and a short link arm. The third is part of the casement window hinge. That being said, this operator can be replaced with either the 39-253RB or the 39-439B. To determine which of these is the right replacement, you'll need to compare the differences between them. Take a look at the video tutorial below for reference.

The compatible replacement cover kits are either the 39-376 (folding) or the 39-452 (non-folding). The opposite handed versions have been tagged below. You'll find the other compatible hardware and accessories in the related products for the operators.