CRL Norex® Butyl Coated PVC Foam extrusions come in both tape and rod form, and are highly flexible, conforming readily to corners and irregular contours. These versatile foam extrusions seal effectively against water penetration to prevent corrosion or moisture damage. They are ideal for sealing joints in RV's, motor homes, trailers, and boats, where joints are subject to the stress of movement and the effects of constant exposure to the elements.