Channel Balancer

Question

Hello!
This is an 18inch balancer that I removed from a single sash window, non-tilting.
It has a stamp of 720 with no additional markings.

Casey · Accepted Answer

Hello,

It looks like you have either our S351-18, with a 15-002 bottom attachment, or S390-18, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. Based on your length, the stamp code should be 1720. If so, you'll need 1720 spring strength option for your replacement balances. Thank you!

Comparison of the S351 and S390 balance shoes.