GB/T 12459  弯头 DN 50-4.590EL

DN 50-4.5 90EL

SO 600-150 RFRJ

PL 150-16 RF)0-RF

47023 M550-4

PL 450(B)-10 FFf5bf-3@.5

BL 500-10 RFr-

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PL 80-150 RF1f50 rffs5 RJRF.0=90-11a(A�5 RJ Sch

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PL 8