Window

Hello,

Your photo resembles the 15-087 housing pivot, which uses the Series 180 coil springs. Once you remove the coil balance from the window, there should be numbers stamped on the coils that you'll use to choose the corresponding strength options. Take a look and compare the specifications below and the accessories related on our product pages to yours. Thanks for posting! 

Series 180 coil balance diagram

Detail of 15-087