All wetted surfaces are constructed of corrosion resistant steel. The unit is cleaned to MIL-STD-1246, level 200A.

Preece provided flexible metal hoses to allow easier alignment when installed and allow movement during vibration.

The units incorporate Preece 51194 quick disconnects to allow the experiment racks to be disconnected from the cooling water and moved around on station.

Preece supplied metal bellows accumulators which accomodate for the volume that is displaced when the QD's are connected and disconnected. The accumulator also allows for thermal expansion of the cooling water when the unit is disconnected. Liftoff pressure, rate and stroke are tightly controlled to prevent the station from sensing a "false leak" in the cooling system. There are 84 convolutions, each consisting of 2, .004 thick diaphragms. The diaphragms are welded od, id, od, id etc, to give the spring characteristics necessary to displace the fluid. The moveable termination is a solid disk and the fixed termination is welded to the housing. The outside of the housing has a 5 micron screen bonded to the end to prevent contamination from entering the thin metal bellows.

The heat exchanger bottom is made from a copper billet which is explosively bonded to a stainless steel billet. The lower half is machined to size, leaving a .040 thick section of stainless where the water will pass by. The bottom is then mated with the top half (lid). The two pieces are then electron beam welded together. This allows the unit to take maximum advantage of the heat transfer properties of copper, while maintaining the requirement of only corrosion resistant steel contacting wetted surfaces. Many precautions are taken with the process to maintain .002 flatness of the finished product.

Preece developed a calibrated orifice is installed to control pressure drop of the cooling fluid. The orifice ensures that all experiment have the same pressure drop (1.5+/-.1psid) so all the experiment racks on station will use equal amounts of cooling water.