I just finished my first bottom drain keggle for my new rig...it passed the leak check ... so I thought I would post some pics.
I used a 1.5" TC long ferrule silver soldered to the keggle and a 1.5" TC x 1" NPS Adapter from Stout for the element. The cover is a 1 1/4" conduit body from HD and the plug is a drilled out galvanized fitting. I cut the threads off the back of the conduit body, and the NPS adapter fit nicely ...with enough room for the clamp. Simply screwed in the conduit body between the element and adapter......no leaks.
A cut-out sanke spear serves as a guard for the sight glass I got from Bobby, along with the 1/2" spud. The flare on one end of the spear fit the bottom of the sight glass perfectly. I used a rubber grommet to center the sight glass within the spear at the top, and a 2" (#10) screw and 3 nuts to provide support to the top. Still need to calibrate the sight glass, but waiting until I get the other keggle done.
The TC parts came from Brewershardware.