The 3 Stage Gasket system in the 4100 Uninsulated Opening System provides enhanced sealing for air and water resistance despite the lack of thermal insulation. It ensures smooth operation, reduces drafts, and improves overall durability, making the system reliable and comfortable for everyday use in non-insulated openings.

• Smooth Operation: Ensures effortless movement of the sash.
• Durable Design: Improves overall system reliability and longevity.