[GuyBFF]

Ok, from looking at my Danger Den Maze 2 "upgrade" it sure looks like 3/8" NPT, if it is british, or something else please excuse me. However, in the process of trying to figure out if my waterblock was the "upgrade" or older version, I spent a lot of time looking into the barbs. There is no reduction in ID size of the barbs they use. I have brass 1/2" NPT x 1/2" barb on my danner mag-drive, and the ID of these barbs is consistent with that of the maze 2 "upgrade" 1/2". I can only speak for it, but there is no neck down inside this barb. Maybe they upped the barb size for the new block then.

Secondly, once I installed my heater core rad. I really believe that I do not require 350gph, and wish I stuck with the 250! bladeRunner's right, my flow is stupidly fast. Water is moving so fast bubbles go by as a streak. Although I can't see any disadvantage to this, the smaller pump would have created less heat.