All compact reactors utilize this size tubing. These are imported from AMS in Belgium. Precisely the right length, complete with cable ties already in place. We do not advise using locally sourced tubing.
Recommended to replace this part inside the pump every 3-4 months BEFORE any issues arise. This is the single most important thing you can do for the maintenance of the reactor. Make sure you do not twist the tubing when installing it. Line up both red lines to face you. Do not use grease or lubricant. 5 minute install and very easy to do.