Help with size of copper tubing and compression fitting

How to Install a COMPRESSION Fitting (PROPER WAY) : 8 Steps (with Pictures) - Instructables

Brass Fitting (Inches Size) Compression Double Union 1/8” 3/16” 1/4” 5/16” 3/8” 1/2” Pipe Fitting Copper Pipe Connector

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NIBCO 1/2 in. CPVC-CTS and Copper Alloy Lead-Free Slip x Compression Union C4733-7-LF - The Home Depot

A Complete Guide to Compression Fittings

Does your Norprene tubing do this to copper blocks?

Type: Compression Union Tube Size:3/4 OD Net Weight: 140g/PC Choosing products dimensions and quantities at column of size and colour

LTWFITTING 3/4-Inch OD Compression Union,Brass Compression Fitting(Pack of 3)

What is a Compression Fitting? Its Types, Working, Applications, Advantages, Disadvantages – What Is Piping

8mm STRAIGHT COMPRESSION EQUAL FITTINGS 4 x GAS TUBE CONNECTORS COPPER PIPE

The Guide to Compression Fittings for Copper Pipe