Compression fittings. How tight do I tighten them?

Always a worry, have I tightened the compression fittings enough? Will I get a leak? Will the fitting come apart when the water goes on? Visit Al`s plumbing shop for parts at www.amazon.co.uk/shop/dereton33 Saved some money on calling a plumber? Click the SUPER THANKS button or donate here, www.dereton33.com/page118.html. Thanks Al.

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