Help with size of copper tubing and compression fitting

Pex Pipe Full Size Male Thread Socket Coupling Connector 1/2- 3/4-1 Compression Fitting Pex Brass Fitting Pipe Fittings for Pex-Al-Pex Pipe - China Brass Fitting, Pipe Fitting

Does your Norprene tubing do this to copper blocks?

Does your Norprene tubing do this to copper blocks?

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

What size of compression fitting do I need?

A Complete Guide to Compression Fittings

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

Brass construction Moody Union Fits 1-inch iron or 1 1/4-inch copper pipes. 3-inch body length, with coupling washers and nuts Use for pipe repair

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

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

10/8mm-11/8mm vs 13/10-16-10mm tubing

A Complete Guide to Pipe Fittings and How to Use Them to Connect PEX, PVC and Copper Tube - Dengarden

The Guide to Compression Fittings for Copper Pipe

Copper Tubing, Pipe, Fittings, Metric, FAST Shipping

PEX Pipe Fitting, Compression Coupling, 1/2 Copper Tube x 1/2-In. MPT