Advanced EK Series is the ultimate Slide Out Seal System. Can be used for new installations or when upgrading worn out rubber seals. The EK Base comes with off set bulb and is designed with straight edge for easy alignment with adhesive backing. Fasteners maybe used to install as well. D Seal, purchased separately, easily slides onto track in base, hides fasteners and provides a positive seal. EK Series may also be used on interior wall for protection when Slide Out Room is extended or when replacing a double seal.