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Truth Entrygard Dual Arm Operator. We would expect you to find 20810 on the linkage arm, which measures 4-7/16" overall length. This is the most common size we find in use. Other common numbers we would expect to find are 31538, 31539, 30841, 30842, 30472, 30470, 20810, or 20544. Also known as a TH-23076 or TH-23077.
4-7/16" link dimension, offset up. For offset down, order Wi1561.
Order Wi1516 if your link dimension is 3-3/4" stamped 20755.
Order Wi1515 if your link dimension is 2-7/8" stamped 20748.
MOST POPULAR SIZE
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.
PART # HAND
WI1510R RIGHT HAND
WI1510L LEFT HAND
Truth Entrygard Dual Arm Operator