AMT500E Posted September 25, 2019 Share #1 Posted September 25, 2019 Looking for info on the order of manufacture for these Robertshaw regulators. Both share the same model / patent #, however they differ slightly in a couple of details as seen. There is a step in the body casting of one which is missing on the other. Im curious if the step was put there to strengthen up the nipple from stress breakage? or something. Guessing the one with the step would have come later in the manufacturing process. The one attached to the hose appears to be missing the gasket that is evident on the other. Any thoughts? Thanks. Link to comment Share on other sites More sharing options...
cricket Posted October 11, 2019 Share #2 Posted October 11, 2019 The data/nomenclature plates read the same?? Can you post pics of the nomenclature? Link to comment Share on other sites More sharing options...
boxerdogi Posted March 20, 2021 Share #3 Posted March 20, 2021 Since we’re on a mini regulator roll...I thought I would bring this thread back to the top. I have a non-stepped Robertshaw 20004 that would be 1964 or earlier and one that is stepped 20004-3 that is 1968. Anyone know when the change in design may have taken place? Link to comment Share on other sites More sharing options...
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