Plumbing problems

[jillwill]

We just got done with replacing the floor in the Globetrotter and are now on to the plumbing. When we removed the black holding tank from under the stool the cast iron cross that connects to the tank and the drains for the bath sink/tub and the kitchen sink had a crack in it. What am I going to use to replace this with? There is a 3" treaded piece that is fiberglassed into the tank itsself so I need something that will thread onto that. PLEASE HELP!!!!!!

[easyride]

Pictures would help,will a 3" female pvc fitting screw into the piece in the tank,cast iron fittings are still available,we just need to know what you need. Dave

[jillwill]

Yes, a 3" pvc fitting will screw into the tank, I will try to post pictures later.