The motorblocks that Royal-Exclusiv uses on their Red Dragon pumps are Askoll / Laguna 1500 and 2000 motorblocks. All of the Alpha skimmers utilize Askoll 1500 motorblocks. Royal-Exclusiv then goes and puts in their own custom impeller shaft, custom impeller, custom pump head, venturi, etc. The only thing that is "stock" about the pump is the motorblock. Anyone Askoll 1500 motorblock will bolt up to all of this.
Thanks,
Jeremy