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D&R OEM Customizable Electric Dynamic Balancing Brass Valve AC 230V DN20 Water Energy-Saving Motorized Control Central, Find Details and Price about Brass Valve Electric Dynamic Balancing Valve from D&R OEM Customizable Electric Dynamic Balancing Brass Valve AC 230V DN20 Water Energy-Saving Motorized Control Central - Ningbo D & R Metal Industries Co., Ltd.