The casing is the outer casing of the heating unit. The casing will vary depending on the model you have. The numerous casing designs have changed substantially over the years as the suppliers strive to make them as user friendly as possible.
Fits a Number of Worcester Appliances
Technical specification
Toilet Cistern CapacityFTW--ERP RatingNot ApplicableSupplier Part Number87161066380Brand NameWorcester Bosch