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Hedland 1/4" Brass NPTF Air Test Kit 1-10 SCFM Air Flow Meter | ISC Sales
CDA - Variable-area flow meters
Badger Meter Hedland Variable Area EZ-View Water Flow Meter w/Sensor, Radel Body, 1/2 in. Female NPTF Swivel Brass Fitting - John M. Ellsworth Co. Inc.