Compression fittings typically have one sleeve that bites into tubing as you tighten the nut, forming a strong seal. They are also known as flareless fittings. Use in medium- to high-pressure applications up to 4,500 psi.

These fittings have two sleeves for extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. Fittings can handle pressures up to 6,800 psi. They are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings.

The flat face of the fitting connects to a tube adapter so you can slide the tubing and fitting sideways to disconnect in cramped spaces. They are also known zero-clearance fittings. Use in applications up to 6,000 psi.