Anderson sash balance

Question

I want to replace the balances in my windows. The balances are still in the window. The only identifying marks I have is D71 7#27 10 86. Measures 6 3/4" by 3"

Casey · Accepted Answer

I recommend SWISCO part number 24-737, Andersen Sash Balance. This can replace Andersen balance boxes stamped with 7#27.