Sorry but this 15mm dimension seems wrong.
Per information here:
http://www.sidewindercomputers.com/bishg14sidse.html "
The length from end of thread to end of thread is 30 millimeters. " BP threads are typically 5mm. So it means that flange to flange, you'd have 20mm (30 - 2x5).. and this is too long by 1.4mm for use with 25mm fans.
Now by the look of the dual o-ring design, I roughly estimate that these can extend about 5mm , and this is too short for a 38mm fan.
BUT I also have more concerns:
1/ These appear much more restrictive than our 1/2" barbs which may affect radiator performance.
2/ More importantly, our welded threaded nuts are not always perfectly perpendicular to the plenum face. Using these fittings, we would have a solid connection between the radiators and if there was the slightest misalignment, it could prevent installation of the fans.. and this is the reason why we chose a "soft" alignment (using tubing), to compensate for this potential problem.
3/ A final concern is the fact that our radiators feature an o-ring groove, and these fittings are designed for a flat face since they have a captured o-ring. If the OD of the fitting body is larger than 17.8mm (the OD of our o-ring groove), then the fitting might not be able to seal.
Based on all of the above and looking at the Poll showing a majority of yesses, it looks like we'll have to include our fittings.
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