Finishing up some piping on my OWB CB5036 install...planned on water thermometers all over the place to monitor stuff...usually get this type stuff from my favorite industrial supply house McMaster Carr but they were 40-50 bucks each there...has to be a better source...what did you guys use? How much $$$ roughly? I assume they just thread into a block with a pex fitting on each end or threaded end that you put a pex fitting on each end?