Double ferrule or Single ferrule hydraulic compression fittings?

Coupler for connecting two pipes in a straight run Male NPT threads on one end and a tube connection on the other This fitting has a double ferrule

1/8 NPT Male x 4MM Double Ferrule Compression Tube Fitting,Stainless Steel SS304 Male Straight Adapter

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Ferrule Fittings - Jaydeep Steels

Double Ferrule Compression Tube Fittings

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Double ferrule or Single ferrule hydraulic compression fittings?

What Is Double Ferrule Tube Fitting? - News - Nantong Naco Fluid

Double Ferrule Compression Fittings at Rs 150/piece

Compression Ferrule Tube Fitting, Brass Ferrule Compression

Single Ferrule Compression Fittings Stainless Steel ISO8434-1/DIN

Brennan Industries N2402 Double Ferrule Tube Fittings