Oatey Masterflash universal roof pipe flashing with a malleable aluminum base and an EPDM rubber boot that trims to fit a range of pipe diameters. Distinct from Oatey's fixed-diameter No-Calk roof flashing (which has a specific molded collar size for one pipe), Masterflash is the universal-fit version - cut the boot at the size mark matching your pipe, and the aluminum base bends to follow ANY roof pitch and profile (asphalt shingle, standing-seam metal, ribbed metal, tile). The EPDM boot is rated for 212 F continuous service, making it the right pick for Type B gas vent installations as well as plumbing stack vents.

• Pipe size range: 1/4" to 4" diameter (trim boot to size at the molded ring marks)
• Base size: 8" x 8" malleable aluminum (bends to ANY roof pitch / profile)
• Boot material: EPDM rubber, 212 F continuous service rating
• Approved for Type B gas vent installations
• Engineered for shingle, metal, tile, and profiled roofing systems at any pitch
• Base color: Mill aluminum (can be paint-overcoated to match shingle / metal color)
• Reusable cut-ring boot marks for multiple pipe sizes within the range
• Installs over a roof penetration with sheet metal screws or roofing nails on the upslope edges, sealed with roofing cement

Tip: The 1/4" to 4" range is the catch-all small-pipe Masterflash - 1/2" to 3/4" condensate lines and pellet stove pipes, 1-1/2" to 2" residential plumbing vents and kitchen drain stacks, 3" main plumbing waste stacks, and 4" Type B gas vents and bath fan exhaust stacks. For larger 4"+ stacks on multi-bath homes or commercial Type B flue stacks choose the 3" - 6" Masterflash (model 14053). Install with the long base edge on the upslope side, weaving the upslope into the next shingle course; never face-nail through the downslope edge.