Window Balance 33 3 BSI NN

Question

I need two of these but the stamp number doesn't match any of your four digit options. It is two digits; 33 and it also says 3 BSI below that. Which stamp option is the right one?

Tom · Accepted Answer

"33 3" is usually the stamp for a 34" balance with a 3330 option. Double-check the length of your metal channel. It should be 34", not 35". If not, you should let me know, because we would need to do some investigating to figure out why the numbers don't match.