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主题 : 法兰式双由令止回阀
材质:UPVC/PPH/CPVC/PVDF 胶圈:EPDM/VITON 规格:1/2"-4" 标准:DIN/JIS/CNS/ANSI
材质:UPVC 胶圈:EPDM/VITON 规格:2"-8" 标准:DIN/JIS/CNS/ANSI
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