Made in the USASPA Shim Pressure Adjustment- change output pressure by adding or removing shims, not springs or pistonsMeets all DOT, TC, CGA and ASTM specificationsCompletely rebuildable by the end userEvery regulator is hand crafted and factory testedSuper low response curve 0-50 psi from full to emptySafetyASTM COMPLIANT bonnet threadASTM COMPLIANT DOT burst discASTM COMPLIANT Low pressure burst diskASTM COMPLIANT Restrictor, bleed hole and safety grooveMini Fill Valve IS hardened, plated 5000 psi rated