1/4" FNPT A style push type coupler are easy to use; simply push plug into coupler to engage, pull sleeve back to remove. A style couplers have a basic flow size of 1/4" and a maximum air flow of 34 SCFM.
Milton Industries 1/4" Fem. Body W/Drag Guard - M-Style
Milton Industries 1/4" Fem. Plug T-Style, 2/cd
Milton Industries 1/4" Fem. Plug M-Style
Milton Industries 3/8" Fem. Plug M-Style
Milton Industries 3/8" Fem. Plug M-Style, 2/cd