Tailored for Vokera Boilers: Specifically designed for boilers requiring expansion vessels with part numbers 20138101 and 20029826, ensuring a precise fit and reliable functionality. 8-Litre Capacity: Ideal for managing pressure changes in domestic heating systems, helping to maintain consistent performance and prevent overpressurization High-Quality Construction: Manufactured using durable materials designed to withstand constant pressure cycles, ensuring a long service life. Protects Boiler Components: Absorbs excess water pressure to safeguard critical boiler parts such as the pump and heat exchanger, reducing the risk of costly repairs. Efficient Performance: Helps maintain steady pressure levels, promoting optimal energy efficiency and consistent heating output. 12-Month Warranty: Backed by a one-year guarantee against manufacturing defects, providing confidence and peace of mind with your purchase., Manufacturer: HTS