I purchased the EK alu watercooling kit, and I would like to upgrade the pump for the system, but I am finding difficulty finding any information as to what the pumps are made of. Most vendors do not list the composition of their pump, but I was wondering if anyone on the forum would know. The reason why I am upgrading is that air gets trapped in one of the radiators at the end of the loop because there is not a enough water flowing through towards the end of the loop. If anyone has any helpful recommendations please list them below.