Smith RA921 and RL921 Difference?

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Does anyone know the difference in the two? Trying to go from my Victor 100fc mixing handle to the regulators (201-05FP and 221-05FP).Tired of shopping....ready to do some cutting or melting or smelting or something other than shopping!Thanks for any help.Last edited by bondobridge; 08-30-2014 at 06:57 PM.
Reply:RL921 is 9/16-18"" on both ends, and RA921 is 9/16-18" on the regulator end and 3/8"-24 on the torch end.  Everything I have (Victor) is 9/16"-18 on each end, except my small Presto-Lite refrigeration torch.http://www.millerwelds.com/pdf/spec_...oductGuide.pdfLast edited by cope; 08-30-2014 at 07:37 PM.
Reply:Thanks for that...helps a lot....got me to my next noob question. My regulator has 1/8-27NPT and my mixing handle has 9/16-18. Which hose would be best. I need to add a set of check valves too somewhere along the line, preferably at the mixing handle. Appreciate further advice. Not sure about the nipples on the handle-check valves? Here is the handle actually. Last edited by bondobridge; 08-30-2014 at 08:01 PM.
Reply:I measure the threads on the regulators and my calipers show 3/8... Guessing here but I think I need the A-B hose (RA921)