GB/T 12459  弯头 DN 25-Ⅱ-490EL5

DN 25-Ⅱ-4 90EL5

BL 300-300 RF

so 80-10 rf8-255

LWN 2"-600 RJ Sch160 ScP

so300-25rf R RF S3

SO 500(B)-16 FF

DN 250-Sch140 TS

WN20-16RF-1.S=

WN80-160 MRFR

WN 80(A)-16 RF=4h40S0F SCHf s����SS50-90040S=446/SRF=6s4F=22=101=M S=10.0(B)-16 RF