Socket Specifications: This listing is for a 7 Pin socket (N type) to power trailer or caravan lights. Ideal for new tow bars or for replacing damaged sockets on existing cars. Brass pins in a durable plastic housing. Provides connections for indicators, side lights, brake lights and fog lamp. Also available with an aluminium case, please see our shop for this version. PIN 1 Yellow Wire (Left Indicator) PIN 2 Blue Wire (Fog Lamp) PIN 3 White Wire (Earth Return) PIN 4 Green Wire (Right Indicator) PIN 5 Brown Wire (Right Side light) PIN 6 Red Wire (Brake lights) PIN 7 Black Wire (Left Side light) This shows the standard wiring colours, but your car might not be standard. If it is not then you should note which pin number each wire goes to before removing the old socket and simply connect the new one the same. Gasket Specifications: This listing is for a gasket / seal for 7 Pin Sockets fitted to tow bars, trailers caravans etc. Ideal for new tow bars or for when replacing damaged sockets on existing cars. Fits over the wire behind the socket to help keep water out of the socket. High quality, thick rubber seal. Includes mounting bolts for the socket. Also fits the aluminium sockets.