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4 Flutterless™ technology with brass surge protector minimizes needle pulsation Brass gauge movement Copper alloy Bourdon tube 1/8" NPT Male connection Calibrated to 1% accuracy Color-coded blue for compound and red for pressure °F features color-coded refrigerant types: R-22, R-134a, R-404A and R-410A °C features color-coded refrigerant types: R-22, R-134a, R-404A and R-407C *Features retard protection to 500 psi " REPLACEMENT CRYSTAL
