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the dcp 4000 is not the same (smaller) than dcp 5000 and up.
if you got the dcp 5000 or higher, then the fittings fit perfectly to 3/4 and 1" pvc.
it looks like the fitting for dcp4000 will work with 1/2" (you only tried 1 and 3/4 in the youtube video).
I think I've seen other people take one side of a 3/4" union, and grind down the disk so it will fit into the jebao threaded ring.
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