At the top of the CSP750 are inlet and outlet ports that are CNC helical machined to 1/4" NPT. This provides for the use of both plastic and metal tubing adapters, typically without the need of additional sealing. Consumers have the option of using 1/4" NPT adapters for configuring a water cooling system to use 3/8" or 1/2" ID tubing



Link: MTB