Compression fittings are one of the most common and versatile methods of joining small diameter tubing
1/2 M NPT straight compression fitting for 1/2 O.D. tube - Kleinn Automotive Accessories
SINGLE RING COMPRESSION FITTINGS (DIN 2353)
Compression fitting - Wikipedia
PVF, Compression Fittings
Compression Fittings
Compression fittings
Tuohy Borst Compression Fittings for Stainless Steel Tubing
Flex Compression Fitting - Optimus Water Cooling
The Basics of Compression Fittings - Beswick Engineering
Compression Fittings Union Couplings – Reliable Fluid Systems
Compression Fittings • MicroGroup
Everbilt 5/8 in. OD Compression Brass Coupling Fitting 800919