Definitely not. That type is for joining a Pipe to a smaller pipe using thin tapered solderless nipples, which crush onto the pipe as the nuts are tightened. The nuts used have to be internally tapered also. It's an obsolete and not very satisfactory system. The SPHERICALseat on that elbow is one of the best set ups and seals on a narrow 45 degree seat on the correct part with a thin line of contact achieving the seal reliably with some degree of misalignment tolerence. Nev