The Pella Double Hung Sash Lift in White is a new sealed part numbered 807N0101, specifically designed for the Pella 0F3700P0 model. This window accessory is essential for maintaining the functionality of your double hung windows, allowing you to easily lift and lower the sash for ventilation and cleaning purposes. As it is a genuine Pella product, you can trust its quality and compatibility with your windows, ensuring a seamless operation for years to come.