Pipe Flashing Master Flash #3, 35 Year, Pipe range 1/4" to 5-3/4" (6.4mm to 146mm). 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.