As a general rule, the only time I will use metallic drain pipe is when the pipe is located in a return air plenum. In your situation, I would use a plastic DWV sanitary tee, with a short section in top and bottom, and no hub band that into the vent. I don't know California code, but in my area what you want to do would meet code requirements. Hopefully Mr. David will see this thread and comment.
Here's the Calif Code reference to wet venting. Hand sink requires 1-1/2 drain and the toilet vent is 2 so the vertical drop between the sink and toilet is the wet vent. 908.1 Vertical Wet Venting. 908.1.1 Where Permitted. Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of one (1) and two (2) fixture unit fixtures that also serves as a vent not exceeding four (4) fixtures. Wet-vented fixtures shall be within the same story; provided, further, that fixtures with a continuous vent discharging into a wet vent shall be within the same story as the wet-vented fixtures. No wet vent shall exceed six (6) feet (1,829 mm) in developed length. 908.1.2 Size. The vertical piping between any two (2) consecutive inlet levels shall be considered a wet-vented section. Each wet-vented section shall be not less than one (1) pipe size exceeding the required minimum waste pipe size of the upper fixture or shall be one (1) pipe size exceeding the required minimum pipe size for the sum of the fixture units served by such wet-vented section, whichever is larger, but in no case less than two (2) inches (51 mm). 908.1.3 Vent Connection. Common vent sizing shall be the sum of the fixture units served but, in no case, smaller than the minimum vent pipe size required for any fixture served, or by Section 904.0.California Plumbing Code
Okay so this would be allowed under California code. keeping it all metal pipe, staying away from pvc or abs, what would you recommend, galvanized or cast iron, I have a pair of cast iron cutters. is there an 1 1/2 no hub by FIP 90 that I can screw a nipple into, or are there cast iron trap adapters, what would I use if I went cast iron. or since its steel, just go steel? this dumby greatly appreciates your help.
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