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Striving to answer customers desire for a more thermally stable Silvia, the release of the Silvia 'M' model includes this foam insulation to surround the boiler, reducing temperature fluctuations. The black side goes out, and the two ends are held together with Velcro. The small hole allows for the expansion (OPV) valve fitting and the semicircle is for where the high limit thermostat is. Suitable for all versions.