RibBracket™ can be used to mount almost anything onto the most common exposed-fastened, trapezoidal roof profiles marketed in North America today. No messy sealants to apply! No chance for leaks! The RibBracket comes with a factory-applied EPDM rubber gasket seal already on the base, and the S-5!^® patented reservoir conceals the EPDM from UV exposure, preventing drying and cracks.