The inner diameter (ID) of the hose would be 3/16".
Hobart 10-50 SCFH Welding Flow Gauge Regulator, Medium-Duty, 3000 PSI, Model# 770971

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- Shatter-resistant polycarbonate gauge lenses
- Anodized aluminum body provides corrosion resistance
- Neoprene diaphragm dual filters provide precise pressure adjustment, protecting the seat from debris and creating reliable operation
- 100% tested and inspected
- Inert gas hose prevents sediment accumulation with smooth interior and exterior surfaces
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