Waterproof Sealed: Different from normal 7 way plug, upgraded 7 pole trailer plug equips with detachable compression nut and rubber grommet on to keep out moisture, protects the terminals from water and dust Size of the wire inlet is 3 or 4inch NPT Sturdy 7 Way Trailer Plug: This male-end 7 pin trailer adapter plug provides a secure connection between your trailer and tow vehicle, 7 pin plug comes ready to splice into your existing trailer wiring to connect taillights, brake lights, reverse lights, turn signals, trailer brakes and auxiliary power Good Strain Relief: All the terminals inside the trailer 7 way plug are tightly keep in place by screw strain relief clamp, which keeps trailer wires from pulling out of the connector, offer reliable connection Construction: 7 blade trailer plug made from heavy duty plastic for long-lasting use, brass terminals great conductivity 7 way rv connector comes with 2 handle hooks on either side for a better grip to make plugging in easier and faster Easy Installation: Installation just requires you to loosen the screws on and body of the plug to pull out the terminals end, splices the trailer light wiring into each terminals according to color and then assemble the plug Colour:Gray Material:Plastic Package Contents: 2 x Trailer Plug 2 x wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.