BMI WINDOW SASH 2090 30

See either our S390-21 or S351-21. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. Your stamp option of 2090 is from an outdated rating system we do not use. To know what stamp code you need, weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the product page. Let me know what you think.

Thanks for the reply. For a window sash that weighs exactly 22.2 lbs, you'd want a stamp option of 2040, which is for a window sash in the weight range of 15 through 23 lbs. Let us know if you have any other questions.