A manifold is a wider and/or larger pipe or channel, into which smaller pipes or channels lead,^[1] or a pipe fitting or similar device that connects multiple inputs or outputs for fluids.

Types of manifolds in engineering include:

Exhaust manifold

An engine part that collects the exhaust gases from multiple cylinders into one pipe. Also known as headers.

Hydraulic manifold

A component used to regulate fluid flow in a hydraulic system, thus controlling the transfer of power between actuators and pumps

Inlet manifold (or "intake manifold")

An engine part that supplies the air or fuel/air mixture to the cylinders

Scuba manifold

In a scuba set, connects two or more diving cylinders

Vacuum gas manifold

An apparatus used in chemistry to manipulate gases

Also, many dredge pipe pieces.

In biology manifolds are found in:

• Cardiovascular system (blood vessel manifolds, etc.)
• Lymphatic system
• Respiratory system

Manifolds are used in:

• HVAC
• Pipe organ
• Plumbing