Bathtub Drain Diagram. Fairly simple drain system. Make sure to remove all the old putty and clean up.
In a work around you could install an aav for that purpose. Bathtubs can come in combination with two drains. So there you have it how to remove a bathtub drain.
You can replace just this plate c.
The bathtub drain is located at the bottom of the tub at the drain hole in the middle or at one end. Watch plumbing vent video below. If you have to hold your drain lever down for the tub to drain it is more than likely the tension spring on the back of the overflow plate. Bathtub drains have two legs one to the main drain opening and the other to the overflow drain opening.