To add a drain to an existing copper drain system

In INDUSTRIAL buildings you want to stay DWV copper fittings and TYPE M copper tubing (or type L, but L is more expensive). You cannot use ABS or PVC plastics here.

What exactly are you doing? Have you taken venting into consideration? If you explain what exists and what you want to do we can tell you more, OK?

Mark

In my area we are allowed to use Cast Iron for drains and vents in industrial buildings. We can also use combination of Cast Iron and Copper. In this case we use special Fernco couplings that allows us to connect two pipes of dissimilar wall thicknesses.

Milo