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Norgren - Compressed Air Regulator: 1-1/2″ NPT, 450 Max psi, Hi-Flow Pilot Operated - 01724848 - MSC Industrial Supply
Husky High Flow Regulator 019-0332H - The Home Depot
Airgas - HCL4000563 - Harris® Model 447-200-CRM Heavy Duty/High Flow Station Back Entry Air and Inert Gases Single Stage Regulator, 7/8" - 14RH (Male) - 034