4 " Air Hose | McMaster-Carr

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208 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Ultra-High-Vacuum Hose with Flanges

Often found in semiconductor manufacturing and other demanding industrial applications, this hose handles nearly perfect vacuum.

Metal Barbed Hose Fittings for Air and Water

Metal hose fittings have better durability than plastic barbed hose fittings.

Smooth-Bore Seamless Stainless Steel Tubing

This tubing has a seamless construction with no weld bead for unrestricted flow and is stronger than welded tubing.

Miniature Stainless Steel Tubing

Also known as hypodermic or needle tubing, this tubing has thin walls and is made to tight tolerances for use in precision applications.

Low-Temperature/High-Pressure D.O.T.
Push-to-Connect Tube Fittings for Air

Connect high-pressure brake lines with fittings that won’t crack in frigid temperatures. Often used on commercial trucks and trailers, these fittings meet Department of Transportation FMVSS 571 safety standards.

Tight-Seal Plastic Barbed
Tube Fittings for Air and Water

Minimize leaks in your line—these fittings have a single barb that creates a smooth clamping surface for extra-tight connections.

Tight-Seal Moisture-Resistant Plastic
Barbed Tube Fittings for Air and Water

Minimize leaks in your line—these fittings have a single barb that creates a smooth clamping surface for extra-tight connections.

High-Polish Metal Quick-Clamp
Sanitary Tube Fittings

The smooth finish inside these stainless steel quick-clamp fittings makes it easy to remove product residue.

Butt-Weld Fittings for Stainless Steel Tubing

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.