Old Style Casement / Marvin Case-Master Roto-Gear Operator

Marvin Casemaster, Awning, French Case-Master, Marvin Venting Window - Old Style Left or Right Handing Operators. LEFT HANDED / LH -10815500  / RIGHT HANDED / RH 10815502 - Dual Arm Roto Gear Casement Window Crank Mechanism. Also known as the Marvin Casement Window Dual Arm Roto-Gear Operator - "B" Arm Dimension is 4 7/16" Long.  Please Specify Left or Right Handing in the Comment Section at Checkout - if none specified, we ship LEFT HANDING. 

The Marvin Casemaster was one of Marvin’s most widely installed casement windows from the late 1960s through 2010, and millions of homes still rely on its original hardware. Although the Casemaster line is discontinued, replacement operators, hinges, locks, covers, and sash components remain available—and identifying the correct parts can be challenging due to multiple generations of hardware. At AllBrandWindowDoorParts.com, we specialize in Marvin Casemaster replacement parts and provide clear identification guides, expert support, and fast shipping to help homeowners and contractors restore smooth operation to aging Casemaster windows. If your Marvin window won’t crank, won’t close, or needs new hardware, we’ll help you find the exact match.
 

IF YOU NEED THE SHORTER "B" ARM LENGTH [ 2 7/8" or 3 3/4" ] You Can Specify in the comment section at checkout.