Help with size of copper tubing and compression fitting

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Putting my first loop together Are compression fittings THIS hard to put onto soft tubing?

How to Use Compression Fittings With Copper Pipe

How to Replace a Compression Shutoff Valve

Basics of Compression Fittings

Putting my first loop together Are compression fittings THIS hard to put onto soft tubing?

Everbilt 1/4 in. Compression Brass Nut Fitting 800629 - The Home Depot

Copper Tube Fittings, Size: 2 Inch , For Structure Pipe at Rs 70/piece in Mumbai

Putting my first loop together Are compression fittings THIS hard to put onto soft tubing?, Page 2

169C-0502 Dixon Valve Brass Compression Fitting - Male Elbow - 5/16 T — HoseWarehouse

Proline Series 5/8-in x 5/8-in Compression Coupling Union Fitting in the Brass Fittings department at

Brass Compression Fittings and Adaptors

Brass Compression Fittings and Adaptors