The Port of Seattle has installed sound insulation packages in nearly 10,000 homes over the past 40 years. A variety of products by different manufacturers were installed at different time periods. Certain products may still be under manufacturer’s warranty.
If your home has Milgard products, they may still be under the warranty provided by Milgard Windows. For warranty or replacement parts, please contact Milgard at Find Your Warranty | MILGARD
You can identify Milgard Windows by looking at your locking hardware to see if it has the Milgard logo or by a sticker on the window frame under MFR Code.
Milgard Windows QuietLine products were used by several Sound Insulation Programs in the 2000’s and have a distinct exterior profile that has a thick rail between the two sashes with a grey colored end plug:
If you have Milgard Windows, the manufacturer can be a valuable resource regardless of warranty status. For warranty or replacement parts, please contact Milgard at Find Your Warranty | MILGARD