FMA Keystone windows from Lows

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Handy Person from FL

Apr 15, 2026 10:32 am

28D spring cover

5 user uploaded images

2 Replies

Bob from SWISCO

Apr 16, 2026 2:26 am

Hello there. This might be an S770-28 Channel Balance, with a 28D stamp. Carefully review the specs and dimensions, and see if this channel balance is what you need.