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Patented dual arm action pushes the sash open while pulling the hinge side of the sash to the open position. When properly installed this operator results in almost effortless operation of both casement and awning-type windows of many sizes and weights, even those with insulated and double-insulated glass (typical operating torque is less than one foot-pound to open and close a 60 lb. sash 90º).
Truth Entrygard Dual Arm Operator. We would expect you to find 20755 on the linkage arm, which measures 3-3/4" overall length. Other common numbers we would expect to find are 31538, 31539, 30841, 30842, 30472, 30470, and 20755.
To determine hand of operator, if your sash lock (window lock), is on the left, you would use a left hand operator. And if your sash lock is on the right, you would order the right hand operator.
3-3/4" link dimension, offset up. For offset down order Wi1520
Order Wi1510 if your link dimension is 4-7/16" stamped 20810.
Order Wi1515 if your link dimension is 2-7/8" stamped 20748.
Left hand shown.
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