Window crank for casement window

Thanks for your post! I believe this window operator can be replaced with either the 39-253LB or the 39-438B. To determine which of these is the correct replacement, you'll need to compare the attachments on the end of the arms; particularly the longer straight arm. Take a look at the tutorial below for a detailed explanation.

These operators are compatible with either the 39-375 (folding) or the 39-451 cover and handle kits. The opposite versions of the operators and cover kits can be found tagged below.

The compatible hardware and accessories can be found in the related products, below each operator's product description.