Milton (S-224) G-Style Coupler, Plug and Air hose Reducer Bushing Kit – 5 Pieces - Air Tool Accessories - Amazon.com
2-pack MILTON 727 Air line hose fittings nipples M style 1/4" male NPT thread | eBay
Milton S776 A-Style ARO 210 Style Air Hose Coupler Male 1/4 In NPT MILS776
Milton (S-224) G-Style Coupler, Plug and Air hose Reducer Bushing Kit – 5 Pieces - Air Tool Accessories - Amazon.com
Milton 5 In ONE™ Universal Safety Exhaust Quick-Connect Industrial Coupler, 1/4-in Body 3/8-in MNPT BX 5 in the Air Compressor Fittings department at Lowes.com
Milton Industries, Inc. 1/4 in. MNPT 3/8 in. I.D. Hose End Fitting (10-Pieces) 602 - The Home Depot