Amazon.com: Horiznext NPT 1" male thread to 1 inch O.D. barb stainless steel pipe fitting, for connecting 1 inch I.D. air hose tubing, pack of 2 pcs : Industrial & Scientific
Proline Series 3/4-in x 3/4-in Barbed Barb x Garden Hose Adapter Fitting in the Brass Fittings department at Lowes.com
19mm - M18x1.5 Barbed Aluminium Hose Fitting Blue Anodized | BAT Motorsport GmbH
Mader Shop pneumatic & compressed air technology
Nylon Barbed Hose Connector 5/16" x 5/16" - 10 per Box | K.L. Jack