If you want aid measuring the centerline radius of the existing elbow, it's best to speak to an elbow manufacturing expert to make sure you get the right measurements and the top Alternative for your needs. Pipe fitter education, metal fitter training, piping and structural fitter fabricator instruction tips on https://howtochooseelbowcenterofp59371.wikifordummies.com/8551918/elbow_center_formula_an_overview