rods for vinayl windows mine is 20 inches long and red tip

Hey there,

Thanks for posting! Your tilt window spiral balance can be replaced with either the 5/8" S600-20 (sometimes considered 9/16") or the 3/8" S900-20. To determine which of these is the correct replacement, you'll need to confirm the diameter of your balance tube.

Take a look at the video tutorial below for reference.