Gastronorm Lid - 1/3 The 1/3 Gastronorm (GN) lid RCGN-1/3-LID-1 by Royal Catering has been specially designed for professional catering and is perfect for usage in restaurants, canteens, snack bars, salad bars, cafeterias, pizzerias, hotels and so on. You can use the lid to close the matching Gastronorm