Gearboxes

Rain system connections to vary the pressure pipe size. To get the most out of the pump's performance, it is advisable to give the pipe a larger diameter (6mm for example) and reduce to 4mm near the nozzles.

Another option would be to use the 6-4-6 tees directly, where the rain line can be taken completely to 6mm and only use a 4mm section from the tee to the nozzle, optimizing the performance of the pump.