Here's a diagram:
As I explained it, the tee (1 1/2, threaded at all ends) is capped with 1 1/2 to 3/4 threaded adaptors at the in/outlet. The inside pipe could either be a 3/4 piece of PVC piping (which I'd bend with heat) or the tube (it's possible to mount a barb on both sides of the adapter). The branch, which goes to the block, would have a 1 1/2 barb screwed into it.
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