PARKER Straight Conversion Adapter: Carbon Steel, 9/16 in x 3/8 in Pipe Size - 39A311|6-3/8 F5OG-S - Grainger
Airgas - RAD64003979 - RADNOR® 3/8" - 24 Male X 9/16" - 18 LH Female Brass Acetylene/Fuel Gas Hose Adapter
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Adaptor 9/16-18 nut to 5/8-18 LH Male [NGP6032] | Gas Control, Hose Fittings & Adaptors-1000 | Niche Gas Products
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Kiowa Ltd. - 3/8 BSP x 9/16 UNF Male Male Hydraulic Adaptor c/w O-Ring - | Kiowa Ltd | Industrial Components Online Store
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