I have an old Durham 1 ½" ELL # 5020 90 XLT made by AB&I. It is a sweep with about a 2" radius that is female tapped on both ends. It is located right after the drain nipple under the kitchen sink. It is so difficult to get a snake through it that I suspect it is probably no longer used as a drain but only as a vent. I think that it may no longer be permitted in the UPC, especially since I can’t even find it in the manufacturers catalog anymore. Can anyone please tell me what the permissible radius is for an 1 ½"? Thank you.
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