High-quality PE (polyethylene) tubing, 12 mm inner diameter (ID), supplied in a 10-metre length. Specifically designed for use as the supply and drain lines in flow-cell installations with Hanna’s BL12x series pool spa controllers – such as the BL120, BL121, etc. – and compatible with the long flow cell (HI7698297) setup. Ideal for use with peristaltic pump delivery systems, it ensures flexible and reliable fluid handling in pH and free-chlorine monitoring applications