Channel balance

Thanks for writing in. This looks like either a S380-19 or S385-19. The only difference between these two balances is the 'depth' of the bottom nylon fitting, so take a look at both balances to see which matches your old hardware. Your stamp option of 18 9 is from an older rating system we no longer use. We recommend that you 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.