3 inch drain copper to ABS

[joe the hockey player]

Hi, I'm using 3 inch to 3 inch rubber hose both side are same thickness as of picture 1 and 2 they told me its good for ABS to cooper or should I use the one in the 3rd picture which one side is good for copper and the other side is for ABS .thanks for your help

 

[Terry]

You only use shielded couplings for that, and the third picture shows the right one for the job. Copper to ABS/Plastic
Without the metal covering, the "rubber only" coupling allow the pipes to shift over time blocking the lines.

 

[Sponsor]

 

[joe the hockey player]

thank you