This is EVABarrier tubing with an 8mm OD (5/16 inch) and is compatible with Duotight and many other push in type fittings.
This tubing is sold by the foot so if you need 3 feet enter 3 in for the quantity.
Please note: We are temporarily suspending all shipments to the USA due to many unjustified rejected packages by customs at the border. Sorry for the inconvenience.