Slide both couplers onto the old pipe then slide the vertical.
Drain clean out cap stuck.
I let the water drain out then i cut out the nut using a metal cut off wheel rotozip.
If all your efforts fail you may have to cut out the fitting and install a new one.
Make sure your reciprocating saw has a metal cutting blade before you turn it on otherwise you re in for a difficult.
Use a pipe wrench to loosen the cap on your main line drain pipe before you open it entirely.
Once it s safely removed use the old fitting as a guide to cut a replacement section of pipe and clue up a new.
Https amzn to 354hhrh plumber s pipe wrench.
Dousing the plug several times with penetrating catalyst lubricant often also called a rust breaker is another way to.
Https amzn to 3lszden make your own sewer.
Open the cap and let the buildup drain out quickly open the cap and step out of the way.