Duotight - 4.5mm(3/16) Barb to 6.35mm(1/4) Stem

Save $0.60 Regular price ~~$2.99~~ On Sale from $2.39

This duotight barb to stem fitting is what you can use to connect a duotight fitting on one side then push tubing over the barb on the other side and secure with a hose clamp