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When a secondary low water cut-off is required to be installed on a steam boiler due to CSD-1 code, sometimes the issue is "where?".
Many residential sized steam boilers do not have a tapping in the right location for the safety manual reset probe-type LWCO.
Certainly the wrong place for this probe is the one shown in this video.
Years ago, we found out the hard way that a LWCO probe located in the equalizer line is a call-back generator due to nuisance lock-outs.
My thanks to Dan Foley of Dan Foley Associates for setting me straight as to why this location is a bad idea.