The purpose of this page is to help you identify which Truth Entrygard Dual Arm Operator
you should order, in order to ensure everything goes back together properly. We find many
numbers on these operators, here are just a few of them, 31538, 31539, 30841, 30842,
30472, 30470, 20748, 20755, 20810, or 20544. The number that tells us the most is
the number that starts with a 2xxxx. This number is the Linkage Arm, that is attached
to the bracket on the hinge side of the window.
The picture below shows a Linkage Arm, it measures 3-3/4", is offset up and is used
on a Left Hand Operator.
The table below shows the linkage arm measurements and the number found on them.
|Linkage Length||Offset||Common Numbers||Model To Use|
|3-3/4"||Down||20755 on bottom||Wi1520|
|4-7/16"||Up||20810 or 20544||Wi1510|
Not sure if you have offset up or offset down, watch our instructional video.
If you have any doubts, do not worry. Call us or email a picture to
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