An easy fix for split boots at plumbing vent flashings

I recently came across a plumbing vent flashing repair device that looked like a cross between a two-piece plumbing vent cap and Darth Vader's helmet.

Oatey Retro Master Flash 8 in. x 8 in. Vent Pipe Roof Flashing with 1/4 in. - 4 in. Adjustable Diameter 14049 - The Home Depot

Plumbing Vent Boot Flashing Repair: Method 2 - Fine Homebuilding

Plumbing Vent Boot Flashing Repair: Method 1 - Fine Homebuilding

Master Flow 2 in. 26-Gauge Pivot Pipe Boot Flashing Galvanized in Weathered Wood PPBG2WW - The Home Depot

Electrical Mast Roof Flashing, Black EPDM

Gibraltar Building Products 1-1/4 in. x 4 in. Rain Repair Roof Collar 89294 - The Home Depot

EAGLE 1 EPDM Flexible Roofing Pipe Flashing Retrofit Split Zipper Boots - On Site Adjustable Roof Pipe Jack Boot with Round Base (Multiple Sizes) (No. 2)

Oatey Master Flash 7/8-in to 4-in x 6-in Epdm Rubber Vent and Pipe Flashing in the Vent Pipe Flashing department at

Vent Flashing Done Right - Fine Homebuilding