Roofseal® (and Roofseal® Pro) functions as a screw tightener and ensures that ROOFTOP® does not leak when installed correctly according to the official installation guidelines. Roofseal® replaces the rubber ring on the SDS (self-drilling screw) and also serves as an indicator for the applicator to prevent overdrilling during the drilling process. Made from the same high-quality uPVC material as ROOFTOP®, Roofseal® has the same long lifespan.