WHALE Socket Electric Mains In UK. The new Whale Mains Electric In Socket allows you to safely hook up 230V/16amp mains power to your caravan, motorhome or camper van while onsite. Slick design - uniform look on the vehicle's exterior walls. Comfortable to use. Waterproof protection. High quality satin finish UV stabilised to prevent damage from sunlight. Overall Size: 103mm (W) x 83mm (D) x 270mm (H) including Lid *Please note Lids Sold Separately. Cut out Size: 124mm (H) x 75mm (W)x83mm (D)