I need to buy what my favorite plumber called a ‘double dynamiter’, a double test plug that you fit down a wye into a drain. It allows you to plug both the main drain line and the wye at once and put drains and vents upstream under test. I used to borrow one, but no more. Nothing that special is available locally so I need a supplier that can UPS it here. Anyone out there dealing with a source of specialty plumbing stuff that will ship?