There are 2 kinds of Dell PowerEdge 2650 servers. One runs at 400Mhz and the other at 533Mhz. The only way to visually tell the difference between them is this: the 400Mhz (Fig. A) has a total of 5 fans on it and the 533Mhz (Fig. B) has a total of 7 fans on it, see pictures below.
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I checked with the manufacture about the question you had regarding if the spill valve is the correct one for the model G 2650 OH. They assured me that it is the right one. If the shaft of the spill valve came out when you pulled it out, and the rest of it is still at the bottom. It looks as if you will have to remove that part of the pump to see if you can get the remaining parts out.
NOTE: Although there are only 5 fans in the Dell PowerEdge 2650 400Mhz, the numbering system is 1, 2, 3, 4, 7. Fans 5 and 6 are on the 533Mhz only.
The 2650 uses Fuji's relatively new xD-Picture Card media.