Just remove the plug and install a reducer to connect the 3/4-in. discharge pipe. If your drains are steel pipe, you’ll need to cut out a section and install a Y-fitting using mission clamps.

A close up of a discharge pipe from the Yukon landfill. A sign warns that arsenic, lead, cyanide, cadmium and hexavalent chromium are permitted substances for discharge here.

A close-up of a discharge pipe from the Yukon landfill: A sign warns that arsenic, lead, cyanide, cadmium, and hexavalent chromium are permitted substances for discharge here.