<https://www.acecompressors.com/product/flexible-nylon-tubing-4mm-od-2-5mm-id-30m-2/#product>
<http://schema.org/description>
"4mm OD 2.5mm ID, Max. Working Pressure 400psi\r\n\r\nNatural Flexible Nylon Tubing - 30 Metre Coil\r\n\r\nCertain sizes are available in 100m Coils. Please enquire for details."
<https://www.acecompressors.com/product/flexible-nylon-tubing-4mm-od-2-5mm-id-30m-2/>