From the manufacturer:

Can't get over it? Just go around it!
Garrdal Is An American-Made, 2-Part Pipe Flashing That Is Designed To Go Around Rooftop Obstacles Such As Wire Masts, High-Efficiency Appliance Stacks And Other Tricky Pipes With Great Ease.

Installs In Less Than 60 Seconds
No Clips Needed
Perfectly Seals All Pipes Up To 5" In Diameter
Extreme Temperatures And UV Resistance
UV Resistant Copylene Rigid Base
UV Resistant TPE collar
New Construction Appearance
Does Not Crack Or Lift With Weathering
Supports American Manufacturing

Every roofer should carry this in their truck!

Roofing

Roofing

L Bracket Roofing Flashing

GARRDAL 2-Piece Retrofit Pipe Flashing