Thanks for the reply. I'm still a noob at this. So the best solution for me is to get 1/2"OD 1/4"BSP fittings, I guess.
Does EHEIM 1048 use 1/4"NPT or BSP? I don't have the original fittings, since it was from an old Swiftech kit which uses restrictive quick connect 3/8" OD fittings.
Zalman block uses a simple side-to-side design, so it probably wouldn't benefit from using longer thread.
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