Tow Ball + Socket + Plug Cover SET PVC 50mm Towballs 7 13 Pin Sockets 12N/S Plug. Tow Ball & 2x Socket Cover SET PVC For 50mm Towballs 7 & 13 Pin Sockets Trailer. DurablePVC socket cover + 12N Plug Cover, designed to keep dirt and water out, reducing corrosion and extending socket life.
eBay