Help with size of copper tubing and compression fitting

Brass construction Moody Union Fits 1-inch iron or 1 1/4-inch copper pipes. 5-inch body length, with coupling washers and nuts Use for pipe repair

Brass Moody Compression Coupling with 1-Inch Iron Pipe Size or 1-1/4-inch Copper Pipes

How to Join Dissimilar Pipes

3/4 Compression Nut Hex Shape 1 Thread Size Brass Compression Fittin – compressor-source

Brass Compression Fittings and Adaptors

Material: Brass; Color: Gold Tone; Fit Tube ID: 4mm / 0.16; Fit Tube OD: 6mm / 0.24; Fit Tube OD: 4mm / 0.16; Thread Size: M10*1.0; Package List: 1

PATIKIL 4mm ID 6mm OD Tube Brass Compression Assortment Kit 1 Set, Sleeve Ferrule & Insert & Nut

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

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

61CL-10 Dixon Valve Brass Compression Fitting - Long Nut - 5/8 Tube S — HoseWarehouse

Color: golden, Material: brass, Product size: , 40 x Φ5（0.2 inches: 1/5” OD), 40 x Φ6.2(0.24 inches: 1/4” OD) , 50x Φ8(0.31 inches: 5/16” OD) , 40x

200PCS Brass Compression Fittings, Ferrule Sleeves with 5 Sizes OD, Compression Fitting Kit for Tubes Connection, Durable Material

Compression fitting - Wikipedia

4 Different Types of Copper Pipe and How to Choose One

What size of BC Series brass compression fitting do I need to order?