The invention relates to a dispensing device, comprising a container and a dispensing head connected thereto, the container and head including a co-operating snap coupling means comprising a plurality of lugs arranged on one of the two parts to be connected and a plurality of recesses arranged in the other part for receiving the lugs in which at least one of the lugs is resiliently deformable and at least one other lug is relatively stiff and non-deformable. Such a dispensing device may swiftly and easily be filled and assembled. At least the lugs are advantageously made of a thermoplastic polyester, like e.g. PET. The invention further relates to a method for filling such a dispensing device with a medium to be dispensed.