Https amzn to 3lszden make your own sewer.
Drain clean out cap stuck.
After this i used the cut off wheel to slice away portions of the cap until i could get near the inner.
Dousing the plug several times with penetrating catalyst lubricant often also called a rust breaker is another way to.
Slide both couplers onto the old pipe then slide the vertical.
I let the water drain out then i cut out the nut using a metal cut off wheel rotozip.
Https amzn to 354hhrh plumber s pipe wrench.
If all your efforts fail you may have to cut out the fitting and install a new one.
Once it s safely removed use the old fitting as a guide to cut a replacement section of pipe and clue up a new.
Open the cap and let the buildup drain out quickly open the cap and step out of the way.
Remove the cleanout plug with finesse and force photo 1.