Forum Discussion
mike-s
Sep 25, 2017Explorer
Dutch_12078 wrote:They not required to have them. Mine only has a "spit valve."
Not meaning to nit-pick, but ASME tanks had an overfill prevention device (OPD) years (1984) before they were mandated on DOT cylinders (2001). They use a bit different design due to the differences in filling, but the purpose is exactly the same.
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