This is. Biasi Combi Boiler replacement Expansion Tank its a red-coloured accessory designed specifically for residential boilers. Made for biasi models this expansion tank is essential for maintaining proper pressure in the heating system. Perfect for homeowners looking to enhance their central heating system, this product ensures efficient and reliable performance. Ideal for DIY enthusiasts or professional technicians, this expansion tank is a vital component in the functioning of a boiler heating system. Was originally bought for Biasi combi boiler Model Serial No. G.C. No. M96.28SM/C2 N036990708 47-583-06 GB However then decided to change the whole boiler due to other component’s needing to he replaced