Center the vent pipe over it and, with a wax crayon ... the part that sits flat on the roof. Use a flat pry bar (sometimes called a Wonder bar) to gently pry up the shingles around the hole ...

Plumbing vent flashings are notorious spots for roof leaks. If you have a leak in ... Once the tabs are free, slip the flat bar under the shingle and tap it up under the nail head.