Description Manuals Videos Articles Clemco #29769 Replacement Clemco CMS-4 CO monitor sensor retainer. Related Parts (1) Parts Included (1) CMS-4 CO Monitor, monitor only #29766 $673.87 1137 Customers Also Viewed CMS-4 Service Kit #29870 $117.80 CMS-4 Mounting Clip #29869 $40.21 CMS-4 CO Monitor, monitor only #29766 $673.87