The HEATKILLER MULTITOP DDC is completely modular and can therefore be easily and quickly expanded to include additional pumps. In addition to the HEATKILLER MULTI EXPANSION-TOP DDC, additional pumps and this expansion kit are of course also required. The kit includes all the necessary assembly materials to operate up to 8 pumps at the same time. The scope of delivery includes two 500mm M5 threaded rods. These must be shortened to individual lengths. The HEATKILLER® MULTI-EXPANSION tops (31018) required for thisare not included in the scope of delivery.