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https://www.shipuniverse.com/maritime-tools/marine-heat-exchanger-fouling-cooling-capacity-cleaning-roi-tool/
Marine Heat Exchanger Fouling, Cooling Capacity & Cleaning ROI Tool – Ship Universe
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https://betamarine.ltd.uk/product/heat-exchanger-o-ring/
Heat Exchanger O-Ring 209-80110 – Beta Marine Spares
NB these are packed as singles but two are required. Please order in multiples of 2 Price is per O-Ring
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