I'm using a SELTZ 1200l/h pump with Senfu rad and DD Maze2. The Senfu rad and the maze2 both use 3/8 and the pump has 1/2 inlet AND outlet. I use adapters to bring 1/2 down to 3/8 and the whole circuit is in 3/8. (BTW it've dremel'd out those inlets on the Senfu so they *are* 3/8)
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