Made of long life, flexible, weatherproof gray EPDM rubber. Flexible, corrosion resistant aluminum base conforms to any panel configuration. EPDM will not crack or break. Pipe diameter markings are clearly indicated for accurate fitting. One piece construction is easy to install. Pleated cone adjusts to any roof pitch and allows for complete flexibility. EPDM has a continuous service temperature range of -65°F to +250°F. Proven resistance to ozone and ultra-violet light. Flashing plumbing, heating, air conditioning, electrical and exhaust vents.