4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches ...
The Trailer Connector Mounting Box, part # RP74641 has slits at the corners of the hole in the back of the box. These slits can be enlarged by using a utility knife, and allow your trailer connector to pass through from the rear. To mount a connector I like the 4 Pole Knock-Out Adapter, part # 30601 with brackets # RM-910030-5 and # C57202.
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