I could not find a Miller part so I called and was able to locate a hard to find part which they shipped and received in a few days.
Collection: Miller Flow Meters
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Miller 23-50-580 FLOWMETER REG,DUAL,AR/CO2/HEL,50 PSIG
Vendor:MillerRegular price $495.32Regular priceUnit price / per -
Miller 7505 SEAL,FLOWMETER
Vendor:MillerRegular price $7.26Regular priceUnit price / per -
Miller 35-30-320 FLOWMETER REG,2-STAGE,CO2,0-60 SCFH,30 PSIG
Vendor:MillerRegular price $741.70Regular priceUnit price / per