GB/T 12459  弯头 DN 20-490EL

DN 20-4 90EL

SO 32-150 RF

WN350(B)-25RF S=10

BL25-150 RF

WN 2"-300 RF Sch40

so100a-16rf f

WN 40-150 RF

TPB-5-12..80RFS80m8

BL200-10RFh1264

SO 2"-150 RFh600 RF Sch80S=3 Ⅱ202020FM2f1@6 Sch830.5-R@RF(BM700-1.0/62-117uot;-900 RF Sc-Spampamp@R