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Your search for "7-way wiring tester plug adapter" revealed the following:

J-JB-11FT
11-Foot Arctic Blue Cold-Weather 7-Way Trailer Cord w/ Junction Box – (J-JB-11FT)
$70.91
Roadmaster RM-164 Hybrid Flexo-Coil 7-Way to 6-Way Power Cord – Blue – 8' (RM-164)
Roadmaster RM-164 Hybrid Flexo-Coil 7-Way to 6-Way Power Cord – Blue – 8' (RM-164)
$97.99
R64F
Trailer Plug Cord Wire Adapter 6 Round Truck End to 4 Flat Trailer End (R64F)
$9.79
F45R
Trailer Plug Adapter 4 Flat Truck End to 5 Round Trailer End Wire Camper Lights (F45R)
$14.82
F7DC
7 way trailer truck plug, rubber gasket & bumper mount (F7DC)
$12.71
Brophy 7-Way Round Pin Trailer End Plug, Die-Cast Metal Housing (R7TD)
Brophy 7-Way Round Pin Trailer End Plug, Die-Cast Metal Housing (R7TD)
$18.11
EXT-7WAY-5FT
7 Way 5 Foot Extension Cord Trailer Camper RV Truck (EXT-7WAY-5FT)
$19.89
7 Way 3 Foot Trailer Extension Cord Camper RV Truck (EXT-7WAY-3FT)
7 Way 3 Foot Trailer Extension Cord Camper RV Truck (EXT-7WAY-3FT)
$18.76
6 Way Trailer Plug W/ 8' Cord Connector Sealed Bargman (50-61-008)
6 Way Trailer Plug W/ 8' Cord Connector Sealed Bargman (50-61-008)
$70.02
J-JBC
7 way Trailer Wire Junction Box Camper Truck weather proof RV Light cord plug (J-JBC)
$10.08
7 Way Plug Holder Stay-Put Trailer Camper RV Boat Tow Ready Mount Electrical (BKP7)
7 Way Plug Holder Stay-Put Trailer Camper RV Boat Tow Ready Mount Electrical (BKP7)
$6.80
Brophy OEM T-Connector for Chevy, Dodge, Ford and Nissan (F7CF)
Brophy OEM T-Connector for Chevy, Dodge, Ford and Nissan (F7CF)
$75.88