You have to cut out a section of the floor so there is room for the drain. Something like a foot wide and 16 inches long.
Hire a plumber.
You would have to build a platform for the tub to sit on. About 3 inches if you are using a floor drain. There is a trap right after the floor drain so you would not need one at the tub. If possible you could position the tub directly over the floor drain but that would eliminate the floor drain which would be a problem if the basement every flooded.
If you have a basement floor drain, chances are that you have a clog downstream somewhere, and it's backing up into your basement.
You hire a plumber to put in a one way sewer drain valve.
The drain breather on a tub is called an overflow drain.
To determine if your tub is leaking from the overflow drain, fill the tub with water and observe if the water level rises above the overflow drain. If water is leaking from the overflow drain while the tub is filled, then it is likely that the tub is leaking from the overflow drain.
Faucet side.
It is not possible to remove a tub drain without using any tools. Tools such as a drain key or pliers are typically needed to unscrew the drain and remove it from the tub. Attempting to remove a tub drain without tools may cause damage to the drain or the tub itself.
To replace a tub drain, you will need to remove the old drain using a drain removal tool or pliers. Then, clean the area around the drain and apply plumber's putty to the new drain before inserting it into the tub. Tighten the new drain securely using a drain wrench, and test for leaks by running water into the tub.
Once the old tub gets into the drain it is impossible to remove.........
Heck no as the sink is higher then the basement drain and water does NOT flow up hill BUT it does seek its own level BUT you can connect a sink drain to a basement drain if you properly trap and vent the line
Usually. Going through the overflow drain gets you straight into the drain without having to make the sharp bend in the tub drain. There could be a trap that comes apart in the drain underneath if it is accessible.