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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 minimizes noise from restricted flow. The internal membrane prevents water from contacting the steel shell, adding corrosion protection. Available in various sizes, it has a replaceable membrane for easy maintenance without removal. It's corrosion-resistant, noise-reducing, and includes a re-charge valve for air pressure adjustments. Compatible with potable water and heating applications, it is WRAS Approved.. RWC Aquasystem Blue Potable Heating Expansion Vessel - 80l Reliance Water Controls (RWC) XVES050100