You can also see the thermometer probe with the brass nut, washer, and high temp o-ring in the top picture at left. This was before I converted to the welded SS couplings. Be sure to put teflon tape on the 1/2" MPT threads of the thermometer or water will seep through the brass nut and leak out the other side between the washer and the thermometer. Even with the teflon tape, it still leaked and the o-ring wanted to squash out if you even barely hand tightened it. Now with the welded couplings, it is wrenched in there REALLY tight...grin.
There is also the copper dip tube obvious in the center of the keg that is connected in the 1/2" SS coupling (again, now welded in) to 5/8" O.D. Compression fitting. This is 1/2" rigid copper, with a 90' angle and then a tee sweated together. I've connected some stainless steel braid over both sides of the tee to keep hops and stuff from draining into the outlet.
The short, stubby 90' copper tube provides the return for the whrilpool during boil and just to help mix everything. I connect the pump to siphon out of the dip tube and return the flow here from the secondary ball valve.
Finally, you can see the new sight glass welded mount that is connected via a brass 1/2" 90' and then a 1/2" MPT to 5/8" hose barb. Again, this was converted to SS 1/2" welded couplings, and it was well worth the money.
