Posted by Sherman in Idaho [72.47.153.28] on Friday, September 05, 2014 at 21:06:54 :
I need to tap into a 4" cast iron drain pipe to add a bathtub drain. I know the proper way to do it is get a special cast iron pipe cutter, cut out a section, and use no-hub couplings to install a plastic wye. One catch is that I don't have the cutter. I've tried cutting that pipe with a sawzall and there are usually glass-hard spots in the iron that wreck the blade instantly. The other catch is that upstream of where I need to tap in, there are two toilets, one of which is in use by a busy 7-days-a-week business. If I cut the pipe one evening, and can't replace it by the next morning, it will be bad.
I've been looking for some kind of saddle tee that would let me cut a hole in the pipe (plasma cutter? concrete hole saw?) and add a tap, but all I'm finding in the way of clamp-on rubber saddle tees are for side sewers (6" and 8"). I could try to make something up myself, maybe by sticking a piece of ABS into the hold and then wrapping a bunch of fiberglass and boat resin around it (I did that once to fix a cracked lead toilet drain pipe and it worked fine), but I'd rather find a proper ready-made fitting, or at least have somebody with experience tell me what they've done that worked. Any ideas?
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