Window sash balance

Quick Learner from Oregon

May 15, 2026 10:26 am

18 inch length
9/16 width
stamped 1720
winged plastic pieces
i just need help determining which series this product is, as a couple of them look similar.

5 user uploaded images

3 Replies

Quick Learner from Oregon

May 15, 2026 10:31 am

Couple more closer photos of the plastic feet.

2 user uploaded images

Bob from SWISCO

May 15, 2026 4:18 pm

Hey there. Looks like you have an S378-18, S380-18, or S385-18 Channel Balance. The only difference between these 3 balances is the shoe depth. See below. For a stamp option choose 1720.

Comparison of the S378, S380 and S385 balance shoes.