1PC Compression Ferrule Tube Fitting 3/4/6/8/10-16 Brass Pipe Double Card Set Copper Joints Tubing Nut Lock Double Straight CZYC - AliExpress

304 Stainless Steel Fitting Coupler Double Ferrule Compression Fittings - 1pcs Dia - Aliexpress

Ring Lock Oil Tube Compression, Oil Pipe Compression Fittings

1PC Compression Ferrule Tube Fitting 3/4/6/8/10-16 Brass Pipe Double Card Set Copper Joints Tubing Nut Lock Double Straight CZYC - AliExpress

Joywayus 3/8 Tube OD Brass Ferrule Fittings Compression Sleeves Brass Compression Fitting(Pack of 50) : Industrial & Scientific

Compression Fitting Fit Tube O.D 1/8 3/16 1/4 3/8 5/16 1/2 5/8 3/4 Straight Equal Reducer Brass Pipe Connector 229 PSI

Compression Ferrule Tube Fitting 4mm 6mm 8mm 10mm 12mm Brass Pipe Double Card Set Copper Joints Tubing Nut Lock Double Straight - AliExpress

Copper Nickel Plating Ferrule Compression Pipe Fitting Connector Thread 1/8 1/4 3/8 OD 4 6 8 10 12mm Tube Adapter PC PCF PL PB - AliExpress

1PC nickel plated brass Ferrule Tube Ring Lock oil Tube Compression Clamp copper connector 4-12mm Female 1/8 1/4 3/8 1/2 BSP - AliExpress

Compression Ferrule Set – Open Source Steel

Ferrule & Nut Set, 3/16 Compression, Brass - MHOxygen

High-Quality Double Ferrule Compression Tube Fittings

3/4 Compression Nut & Ferrule Combo for 3/4 OD Tube Brass Captive Sl – compressor-source