This Ideal expansion vessel kit is an essential component for any pressurized heating system, designed to maintain a constant and safe pressure level within residential boilers. It is compatible with numerous Ideal boiler models, including Logic, Logic System, and Logic Code Combi. Please note that boiler spare parts must be fitted by a certified Gas Safe engineer. Orders received before 4 pm are typically dispatched for the next business day delivery. Fits Models (Dependent on Serial Number): Ideal Logic, Independent, i-mini, Classic Combi, iCombi, Instinct, Exclusive.