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The formula for "Take off" 45degrees elbow: 1.) For Metric: N.P.S. x 5/8 2.) For Imperial: N.P.S. x .625 Formula for travel of 45 degrees: Run x Cosecant 45degrees = Run x 1.4142 =
39in.
1-13/16"= The tangent of half the degree X the radius of the elbow.
Measure to the center of the Ell and decuct for the threads ..
1/2 inch