Ecco channel balance 2666 Bsi

A professional from Baltimore Maryland says:
December 30, 2020
Hey I have a bunch of these balances and it's very hard to open or close my window I'm looking to upgrade the hardware
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Bob from SWISCO responded:
December 31, 2020

This looks like either an S351-27 or S390-27, depending on the depth of the bottom nylon shoe. Compare both with your old hardware to see what matches best. Your old stamp option is a bit unusual; to know what new option to pick, obtain the exact weight of the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the balance shop page. 
27" Series 351 Channel Balance
27" Series 351 Channel Balance
S351-27
$10.77
27" Series 390 Channel Balance
27" Series 390 Channel Balance
S390-27
$10.55
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