The 25 and 30 Series are a range of PE/PVC Infusion Lines. They have a flexible, transparent PVC outside and are chemically inert Polyethylene on the inside.
The 25 series range from 10cm to 200cm and come with a slide clamp.
The 30 Series includes an Anti-Syphon Valve. Anti-syphon valves prevent syphoning. An example of which would be preventing the contents of a syringe, under the force of gravity, from emptying into a vein.
These are available in 150cm and 200cm straight infusion lines and 300cm and 400cm Coiled lines.