Avoid this problem by using two wrenches, one holding the metal pipe tee into which the switch base is screwed, and the other turning the switch base against the tee.
Hook-up drawing indicates tubing slopes, position of instrument in reference to process tapping point, scope break between instrument vs piping. Hook-up drawing also gives information the requirement of bulk material for each installation.
Float Switch Installation Wiring And Control Diagrams
Instrument Hook-up Drawing
However if you're like a few of our more adventurous readers and you want to replace just burned pressure switch contacts or a pressure switch hook up drawing with a hole in it, see this separate article: You can see another close nipple in your photo above - between the galvanized pipe tee and the metal to plastic bushing that adapts the whole setup to fit into that white plastic fitting between the green and yellow arrows in our annotated photo.
Pressure switch hook up drawing
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