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Well according to IPC table 706.3 a short sweep would have worked but I don't believe any such fitting exists in ABS? I was mainly curious why my plumber had used a 1/4 bend when under IPC it looks unacceptable. Didn't know if that was allowed in 1998? I am moving toilet and can basically fit...

thanks for the reply but I have no reduction in size nor a 4 x 3 flange. I'm simply talking about a change in direction from vertical to horizontal and that my plumber used a regular 1/4 bend fitting

in 1998 my plumber on my new house used a 1/4 bend at the bottom of my toilet drop(approx 24 inch drop)before it turns horizontal. I am redoing the bathroom and rough in could be simpler if I reused this transition but in NH under IPC it appears to me this should have been a long sweep elbow...