Small Drain Bladder

You should only use the bladder if you can insert it on the septic tank side of the guest bathroom. Otherwise, you are going to have a major mess on your hand. The bladder is very effective but any drain openings must be behind you.

I would give it a try I’m thinking all will be well. If debris is movable this bladder will do the just

Bought one for an emergency job, came through in a pinch.

It will build up to the pressure value of your house water line. If the water pressure in your house is 50 psi then the bladder and the pipe will pressurize to 50 psi.

The coupling that screws into a garden hose is the widest part (about 1 1/4"). The rubber part that expands is .9" (.1" under 1"). I used it on the inside of a 2 1/2" pipe and it expanded and worked as advertised. Don't think it will fit through a 3/4 inch hole in that the rubber part doesn't compress or collapse.

I see no reason why it wouldn't work. The bladder expands and seals the pipe so that water from it won't back flow. That means water coming from behind it won't go past it either.

The 4" will work, it is less than 4". As long as it fits it will work. I used it in a 3-3/8" pipe.

it should say on the cardboard backing that it's packaged with. There are 3 sizes that I saw available at Home Depot. The smallest is good for bath sinks. The medium size works for clean out pipes usually located outside your house. I think those are about 3 to 4 inches diameter. I had a clogg which required the use of a snake to get it open and then I cleared it with the bladder.

use a snake to get it out

Yes you can make it fit