LiftMaster 041D9042 Cover (RJO) Viking E4 Kit Operator Option but 3-button switch requires constant

but 3-button switch requires constant pressure on each button

The block adds/delete feature allows quick setup

Time range adjustable from 1 sec to 60 min

or industrial applications

LiftMaster 041D9042 Cover (RJO) Viking E4 Kit Operator Option but 3-button switch requires constantLiftMaster 041D9042 Cover (RJO) LiftMaster's 041D9042 is a LiftMaster RJO Replacement Cover. This replacement cover is "Black" in color, and is used with various LiftMaster Wall Mounted Garage Door & Light Duty Commercial Door Openers. Check the manual or replacement parts diagram for specific part information before ordering to ensure compatibility. Genuine LiftMaster replacement part. Compatibility LiftMaster 8500W LiftMaster 8500WLA LiftMaster