The bottom piece is machined from aluminum. It threads onto the main body and is sealed with an o-ring. The blue compression fitting is threaded into the return port. I'm a bit puzzled by the presence of this fitting. There is no mention of its purpose in the (very well done) manual though it seems intuitive that the returning fluid should be directed away from the pump intake. I see an experiment in my future.
The pump is an Eheim 1000 series submersible unit, having a maximum output of 300 liters/hour (80 gallons/hour) with a maximum lift of 0.5 meters (1.6 feet). Given this spec, you'll want to place the reserator close to the same level of the highest block in your system. For example, I wouldn't advise placing the reserator on the floor if the computer lives on your desk. Just to the right of the pump is a nut covering a rubber ring, providing a watertight seal for the power cord. Zalman thoughtfully provides a blank nut and extra sealing ring should the user wish to replace the pump in the future.
After opening the clamshell retail package, the CPU waterblock and mounting hardware can be unpacked. The included manual is good and compliments the larger kit manual nicely. This block can be mounted to virtually any motherboard, with the exception of the new AM2 boards.
The gold-plated copper base has a flawless finish. Hose barbs and clamps are provided should the user, for some reason, wish to forgo the pre-installed compression fittings.