I have to remove the U-trap below a washbasin
drain, all PVC pipe installed about 1987 -- and
am unsure how much force to exert on the
nuts at both ends of the U-trap section. Would
these nuts have been cemented with some
sort of PVC solvent or just Teflon plumber's tape?

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)