R-454B (XL41) 20 Lbs Refrigerant Virgin New Factory Sealed Gas 326058-758 Thermal Resilience: The Class F
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R 454B (XL41) 20 Lbs Refrigerant Virgin New Factory Sealed Gas 326058 758 Thermal Resilience: The Class F Thermal Resilience: The Class F insulation and DuPont Rynite molded coil prevent thermal breakdown in high heat HVACR environments this kit provides the precise tolerances required for reliable HVAC valve troubleshooting and long term system stability