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阻水器WB250 .245 .36 .60 1/16 NPT .250 WB344 .334 .41 .71 1/8 NPT .344 WB375 .365 .41 .71 1/4 NPT .375 WB437 .428 .43 .78 1/4 NPT .437 WB562 .552 .57 .92 3/8 NPT .562 WB688 .678 .64 1.06 1/2 NPT .688