Panasonic LJ-SK56A Installation Manual page 33

Processing the Knockout of the Base
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Please remove the knockout only where necessary to retract cable.
1) Pressing a tool to knock out by tapping the tool with a hammer, punching a knockout.
Knockout
Screw Driver
Hammer
2) Remove the metal pieces that occurred when punching a knockout. And remove the burr of the edge of the knockout,
paint the rust.
Paint
3) Connect the pipe to the base.
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