The filling bottle is designed to make your loop filling process much easier. Very convenient for mixing the EK-CryoFuel concentrates with distilled water. The telescopic tube of the filling bottle can reach even the most remote and crammed fill ports. The narrow tube does not require the user to unscrew the entire reservoir cap to fill the loop with coolant, removing the fill port plug is more than enough. This filling bottle can also be used to suck out coolant from the most remote reservoirs as well. Just squeeze the bottle, insert the tube into the coolant and let the vacuum take care of the rest.