Remove the old shower head, unscrewing it, using pliers if necessary. Scrape away any old putty around the threads of the shower stem, if necessary.
Roll the putty in between your hands until it begins to soften.
Spread on the threads of the shower stem in a liberal amount, ensuring full coverage. Wipe away any excess putty and attach the new shower head.
Pry off the shower drain collar by sliding a putty knife under it and pushing upwards to break the seal with the old putty.
Clean away any old plumber’s putty by scraping it free. Dry the area thoroughly and remove any debris from scraping the old putty.
Roll a strip of plumber’s putty that’s approximately ½ inch thick and long enough to fit around the drain hole. Press it into place around the drain hole.
Push the new drain collar in place over the putty until it begins to ooze from the sides. Wipe away the excess that oozes out.