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The Bard 5651-216 is an OEM thermostatic expansion valve (TXV) used on Bard wall-mounted packaged heat pump equipment to meter refrigerant flow and maintain proper coil feeding under varying load conditions. This valve is listed in Bard replacement parts literature as the heating expansion valve, making it a critical component for stable heat pump operation and for protecting the compressor by keeping superheat where it belongs. Your description of 3/8 inch by 3/8 inch connections with a 10 percent bleed is a common Bard specification for this application, but because TXVs are application-specific, we recommend matching the unit model and serial to the correct parts list before ordering to ensure the proper fit and performance.