The expansion tank of aqualis series are equipped with a tube made of borosilicate glass , which in contrast to the Plexiglas tubes commonly used for expansion tank has a very high hardness and scratch resistance, very low thermal expansion and excellent chemical and thermal resistance . The glass tube, 100 ml and 150 ml of variants has an outer diameter of 50 mm and a wall thickness of 5 mm. Base and lid of the aqualis series are made of Delrin , are connected top and bottom by a stainless steel rod .

The aqualis DDC 100/150 ml versions are intended for direct mounting of a Laing DDC pump to the reservoir. At the back , four decoupling rubber (Art. 52220 ) are screwed to the mounting on the PC case in the base of the surge tank , alternatively, can be attached to the reservoir and pump using the mounting tabs of the pump in the PC case .

All 100 ml and 150 ml variants are also available with a nano coating available , which allows water to simply run off the inside of the glass tube.