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The Aquasystem blue potable heating expansion vessel features a stainless steel bolted flange to prevent corrosion. Its extra-wide membrane opening reduces noise from restricted flow. The internal membrane keeps water away from the steel shell, further preventing corrosion. Available in various sizes, the vessel boasts a replaceable membrane for easy maintenance without removal. It also includes a re-charge valve for topping up air pressure. Suitable for both potable water and heating applications, this WRAS-approved vessel ensures reliability and efficiency. Enjoy a corrosion-resistant and noise-reducing solution for your needs.. RWC Aquasystem Blue Potable Heating Expansion Vessel - 50l Reliance Water Controls (RWC) XVES050080