A Class Grates Door Track Subsill Drains are designed to provide an entirely seamless and fully integrated connection between any indoor and outdoor living areas. Our Door Track Subsill Drain is designed to provide an external grate which is able to collect condensation or water on the interior or exterior of any sliding or bi-fold door or window and direct the water away from the entry. All of our drains are made to order, within 2-3 days, using 316 Plus marine grade stainless steel and are compatible with all commercial and residential installations. All drains are easy to install, eliminate water build up, and have built in fall.