For an easy way to connect copper pipe without solder, you can pick up push-fit fitting at your local hardware store. Push- fit fitting are code in the US and also approved for behind wall use.
For DIY projects, this is a great product.
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https://remodelingvideos.club/plumbing repair/once-you-learn-this-secret-you-will-never-throw-away-an-old-spark-plugs-again-creation-tips