Sera suction cup holders 18 mm 2kpl E

A suction cup holder with a clamp diameter of 18 mm. Two pieces per pack.

What it fits: the manufacturer lists sera aquarium heater thermostats, thermometers and hoses. The holder is a general purpose part for anything whose diameter matches this figure.

The dimension is the criterion, not an estimate: the range has three sizes – 12, 16 and 18 mm. Too loose a holder lets the device go, too tight a one will not fit at all. Measure the part before ordering. 18 mm is the largest in the range and suits the thickest heaters.

Why two pieces: the rubber hardens in water over time and stops gripping, even though the device itself is fine. A longer device such as a heater also often needs two holders to stay straight.