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Originally Posted by pHaestus
The aquacomputer res most likely does NOT use 1/4" NTP. I'll wager it is BSP; a non tapered thread that has a slightly different tpi (thread per inch) than NTP and relies on an o-ring at the end to seal. Having said that, 1/4" NPT fittings with 3/8" barbs thread into the BSP reasonably well while the 1/4" NPT x 1/2" barbs barbs do NOT. I haven't ever tried the Plug N cool barbs on a BSP block...one minute and I will
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Most watercooling gear uses BSPT - tapered BSP threads, they're similar to NPT except the TPI difference. It's quite uncommon to see people using BSPP as they need an o-ring or whatever.
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Originally Posted by nexxos
Thanks for the info. It is all so confusing! As I'm in the UK, I worked with BSP thread, and here 1/4" BSP still has 1/4" ID, while 3/8" BSP has 3/8" ID. I sort of logically assumed that the same would apply to NPT
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No they aren't - BSP are similar overall dimension to NPT, 1/4" BSP is typically around 3/8" ID and 1/2" OD.