- Works with Primed Wood Casement Windows manufactured from 1960 to 1974.
Note: The #7073B operator also replaces (discontinued) Roto Gear Operator model #2520 manufactured 1945 to 1960. To identify this old style operator, look on the end of the operator arm for either a brass swivel or a round button shoe. You will also need to replace the operator channel - part number 0532108.
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