Hopkins Mfg. - 7 RV Blade to 4-Wire Flat Adapter.
This Adapter made by "Hoppy" includes a dust cover for the 4-Wire end as well as an Impact and Corrosion resistant ends and terminals. Also supporting a flexible wire of which increases installation options.
Hopkins Mfg. has been around and trusted since 1958, and is also the leader in towing electrical products.