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The brass fittings shown came with the exchanger and I screwed and then soft soldered them ( I found out that you can soft solder stainless if you are quick and dont allow the stainless to colour, you must also use lead/tin solder and acid flux)
I plan on using this one to make a heatpump out of an aircondioning unit, hence the soldering to seal against high pressure
Different ones have different types of fittings so either get ones that are a normal plumbing fit or ones that you can solder up after.
There are some on ebay but they tend to be expensive, a tame plumber is by far the best bet.
Regards John
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