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MRCOOL® Pre-Charged Cased A-Coil (MCMP*OTB Series) — R-454B, Pre-Installed TXV, Multi-Position, CoolGuard® Upgrade smarter. Install easier. Live better. The MRCOOL® Pre-Charged Cased A-Coil is a next-generation, pre-charged evaporator coil designed for modern, high-efficiency HVAC systems. Featuring R-454B refrigerant , pre-installed TXV , CoolGuard® corrosion-resistant coil , and multi-position f…