I need to establish a new drain and vent for relocated kitchen sinks, deciphering the plumbing code and existing cast iron left me with questions below (also see a proposed design attached).
- The first-floor vent can only attach above the flood line of the second floor sink (as shown in the diagram)?
- Are there any rules governing how close the first-floor vent connection is to the sink? I.e. can I just install it adjacent to the stack? (Seems to have been so in the original design but with shorter drain arm.)
- When the first-floor vent re-connects to the stack, am I just using a wye fitting there?
- The second-floor sink vents via the stack itself, and no special venting is required, correct?
I've parsed the requirements for DFUs and believe 2" will be adequate for the drain, also a prior question established the rise/run and width of drain arm, thanks.