window channel marked 1510

A quick learner from 33415 says:
March 22, 2023
this measures 16". this is from a metal single hung window.
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Jasmine from SWISCO responded:
March 22, 2023

Thanks for posting! Your balance could be either our S351-16 or the S390-16 with a 1510 stamp. To confirm which series you have, you'll need to confirm the depth of your bottom shoe. It should either be 1" or 1-1/8". You can use the diagram below for reference.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
16" Series 351 Channel Balance
16" Series 351 Channel Balance
S351-16
$9.34
16" Series 390 Channel Balance
16" Series 390 Channel Balance
S390-16
$9.34
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