The ultimate Slide Out Seal System. Can be used for new installations or when upgrading worn out rubber seals. The base comes with wiper and is designed with straight edge for easy alignment with adhesive backing. Fasteners may be used to install as well. The D seal easily slides onto the track in the base and hides fasteners and provides a positive seal. Kit may also be used on interior wall for protection when Slide Out Room is extended or when replacing a double seal. Two piece system, must order one base and one D seal for a complete system.