Give a look at this video at the end he is telling hydro series have one power connector which you can connect to three pin or four pin fan power header.
It is not the exact cooler model but it comes under hydro series so there is not much difference.
There is no need for fan splitter unless you are using more than one radiator fans.
Really sorry new to this website.
The motherboard i am using is the asus b250m-k, case is the cooler master master box lite 3 and the cpu aio it the Corsair h45
Give a look at this video at the end he is telling hydro series have one power connector which you can connect to three pin or four pin fan power header.
It is not the exact cooler model but it comes under hydro series so there is not much difference.
There is no need for fan splitter unless you are using more than one radiator fans.