[Joe K]

As above, soldered. Could be repaired. If you return it for credit/replacement, it probably will be - and re-sold.

Meanwhile you could take the opportunity to "fine tune" this and re-solder it - meanwhile fill the lower end with solder and then re-drill the orifice. This should normally be followed by a "flow test" (there is a kit sold to help you do this too) but many (such as myself) just do the drilling and call it "close enough."

Your choice. Jets you get from most all parts suppliers are notoriously suspect, and subject to defects as befits their sourcing by in large in the Pacific Rim.

Joe K