weird reservoir question

[queen]

Hi, just had my pump combo die on me the other day so i have bought a new pump (EK DCP 4.0) and a reservoir (Alphacool Slot-In) that fits in a cd drive bay, my question is, the hole to fill up the reservoir is not on the top but rather on the back next to the in and out holes, am i missing something here or is there a trick to filling these things up? gonna tackle this tomorrow morning so any help would be greatly appreciated, thanks

 

[kilobravo]

There must be a fill hole at the top.Are you sure,you havent turned it upside down.