1/4" NPT M-Style Coupler and Plug Kit, (5-Piece) — Milton® Industries Inc.
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 (S-224) G-Style Coupler, Plug and Air hose Reducer Bushing Kit – 5 Pieces - Air Tool Accessories - Amazon.com
Milton 5-In-ONE 3/8 in. ID Universal Safety Exhaust Hose Barb Coupler (Box of 50) 1755BK - The Home Depot
1/4" NPT M-Style Coupler and Plug Kit, (12-Piece) — Milton® Industries Inc.