Excellent quality brass fitting connector 1/4. With G1/4 male thread / 10mm hose barb.
3/8' Male Thread Hose Pipe Fitting X 10mm Barb Hose Tail Connector Stainless Steel Hydraulic Hose Fitting - China Coupling Stainless Steel, Stainless Steel Quick Coupling
Brass Hose Barb Fitting,Connector,12mm Barb x G1/4 Male Pipe Adapter - Gold Tone - 1/4 G x 12mm - Bed Bath & Beyond - 27578899
Metal Connectors & Fittings
Brass Male Thread M20 M20x1.5 to 10mm 3/8 Hose Barb Fitting Connector Adapter
PVC 1/2 3/4 Male/female Thread X 8mm-16mm Hose Nozzle Connector Pipe Fitting
1/4 BSP Male x 10mm Hose Barbed 304 Stainless Steel Pipe Fitting Hose tail Connector - AliExpress
BOOST products Screw-in Adapter NPT 1/8 male to Hose Connection 10mm (3/8) - satin black
Pneumatic accessories
Metric Male Thread M12 M12x1.0 Barb 10mm 3/8 in Adapter Connector Hose Fitting
1/4 BSP MALE X 3/8 10mm STRAIGHT HOSE BARB WATER FITTING