Here's a link to a photo of a stainless steel tubing union joining a brass end handrail to a stainless side handrail on a Resin car Works acid tank car shell. The union is 0.020" I.D. and the handrails are 0.019" O.D.

http://www.pullmanproject.com/SS%20Union.jpg

			http://www.pullmanproject.com/SS%20Union.jpg
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 Tom Madden