Emergency Parallel Battery Knob, Yellow Easy Fit. This battery knob option for 701 Switches is for applications where an emergency parallel switch needs to be highlighted. Easy-fit panel-mount rotary knob with screw terminal connectors; contact materials include copper, brass and silver. Order separately. Replaces existing knob. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (DEHP) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. "Great Product" (marketing endorsement from marketplace listing).