Pipe Flashing Master Flash No. 2, 35 Year, Pipe Range, 22mm to 101.5mm The only 35 year warranty offered by manufacturer. Aluminum base allows the pipe boot to conform to any panel configuration and most roof pitches. A simple solution to flashing a pipe penetration through a metal roof. Cut lines clearly marked to allow for easy installation for multiple pipe sizes. Installed in just 5 minutes, field tested and proven product design.