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DN15 DN20 DN65 DN80 Q41f-10t Brass Flange Ball Valve Zero Leakage for Oil Immersed Transformer Oil Drain, Find Details and Price about Ball Valve Transformer Ball Valve from DN15 DN20 DN65 DN80 Q41f-10t Brass Flange Ball Valve Zero Leakage for Oil Immersed Transformer Oil Drain - Hebei Chijiang Import and Export Co., Ltd.