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 Regulators
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Miller 321-70250000 REG,HPC,2-ST,50PSI,1/4FNPT DPM SS,CGA660SS
Vendor:MillerRegular price $1,506.35Regular priceUnit price / per -
Miller 313-70240000 REG,HPC,1-ST,250PSI,1/4FNPT DPM SS,CGA580SS
Vendor:MillerRegular price $1,506.61Regular priceUnit price / per -
Miller 321-70210000 REG,HPC,2-ST,50PSI,1/4FNPT DPM SS,CGA326SS
Vendor:MillerRegular price $1,509.63Regular priceUnit price / per -
Miller 312-85220000 REG,HPC,1-ST,100PSI,1/4 TB SS DPM,CGA330SS
Vendor:MillerRegular price $1,515.89Regular priceUnit price / per -
Miller 322-00200100 REG,HPC,2-ST,100PSI,1/4FNPT,CGA320SS
Vendor:MillerRegular price $1,520.39Regular priceUnit price / per -
Miller 322-83240000 REG,HPC,2-ST,100PSI,1/4 TB SS,CGA580SS
Vendor:MillerRegular price $1,526.05Regular priceUnit price / per -
Miller 322-81240000 REG,HPC,2-ST,100PSI,1/8 TB SS,CGA580SS
Vendor:MillerRegular price $1,526.05Regular priceUnit price / per -
Miller 320-83220000 REG,HPC,2-ST,25PSI,1/4 TB SS,CGA330SS
Vendor:MillerRegular price $1,526.05Regular priceUnit price / per -
Miller 323-00230000 REG,HPC,2-ST,250PSI,1/4FNPT,CGA350SS
Vendor:MillerRegular price $1,530.37Regular priceUnit price / per -
Miller 312-70310000 REG,HPC,1-ST,100PSI,1/4FNPT DPM SS,CGA705SS
Vendor:MillerRegular price $1,535.41Regular priceUnit price / per -
Miller 323-00240000 REG,HPC,2-ST,250PSI,1/4FNPT,CGA580SS
Vendor:MillerRegular price $1,540.08Regular priceUnit price / per -
Miller 322-00240000 REG,HPC,2-ST,100PSI,1/4FNPT,CGA580SS
Vendor:MillerRegular price $1,540.08Regular priceUnit price / per -
Miller 320-00250000 REG,HPC,2-ST,25PSI,1/4FNPT,CGA660SS
Vendor:MillerRegular price $1,540.08Regular priceUnit price / per -
Miller 320-00240000 REG,HPC,2-ST,25PSI,1/4FNPT,CGA580SS
Vendor:MillerRegular price $1,540.08Regular priceUnit price / per -
Miller 320-00220000 REG,HPC,2-ST,25PSI,1/4FNPT,CGA326SS
Vendor:MillerRegular price $1,540.08Regular priceUnit price / per -
Miller 323-00250000 REG,HPC,2-ST,250PSI,1/4FNPT,CGA660SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 323-00220000 REG,HPC,2-ST,250PSI,1/4FNPT,CGA330SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 322-00230000 REG,HPC,2-ST,100PSI,1/4FNPT,CGA350SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 322-00220000 REG,HPC,2-ST,100PSI,1/4FNPT,CGA330SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 322-00210000 REG,HPC,2-ST,100PSI,1/4FNPT,CGA326SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 321-00200000 REG,HPC,2-ST,50PSI,1/4FNPT,CGA320SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 320-00210000 REG,HPC,2-ST,25PSI,1/4FNPT,CGA326SS
Vendor:MillerRegular price $1,542.24Regular priceUnit price / per -
Miller 322-00250000 REG,HPC,2-ST,100PSI,1/4FNPT,CGA660SS
Vendor:MillerRegular price $1,554.09Regular priceUnit price / per -
Miller 321-00000102 REG,HPC,2-ST,50PSI,1/4FNPT,1/4FNPT
Vendor:MillerRegular price $1,573.03Regular priceUnit price / per