The patented (#7,770,335) "Slide from the Side" Galvanized Retro-Spin Roof Flashing allows for a new roof Jack installation around fixed structures. An Electric Service mast is a good example. Retro-Spin™ metal roof flashings are roof jack/pipe flashings which create the rise in a roof system that protects penetrating elements.
This ingenious design spins open, enabling installation of the flashing from the side. After the structure is centered inside the flashing the installer merely rotates the assembly 180 degrees and secures it into place. The only tool required is a hammer! This design simplicity eliminates taking apart a penetration structure in order to slide an ordinary flashing into place.
Also see the Retro-Split Storm collar as a "Counter Flashing" weatherproofing the entire assembly.