Genuine OEM replacement part, this item is sold individually.
This part is used in various places in the compressors listed below.
By its part name, it is used to clamp hoses onto certain parts on the compressors.

This is a genuine Porter Cable replacement part, it is sold individually.
The purpose of the N044359 Tube Seal is to prevent an air leak.
It is placed on the outlet tube coming from the head of the compressor.

Genuine OEM replacement part, this item is sold individually.
The purpose of this belt is to run the compressor to create air to supplied to the Compressor tank.
It is driven by the electric motor, and attached to the flywheel, motor shaft and Idler pulley.
It is used on the compressors listed below.

When you use a compressor the air that is compressed inside the tank will condensate and leave water inside the tank.
If it is left in the tank too long it can start to rust out the inside of the tank.

The Drain Valve should be opened up and let the water drain out.
The water will build up if you have a tendency to leave air in your tank for a long period of time.
You should drain your tank after each time it is used to prevent this from happening.

This is a genuine OEM replacement part, it is sold as a individual kit.
The purpose of the N008792 Regulator Repair Kit is to repair the regulator on the models shown below.
Over time the internal parts of the regulator will become worn and have to be replaced.

This is a huge feature on these compressors, inasmuch as on other compressors you have to replace the complete manifold assembly.
It also includes instructions on how to install it.

This is a genuine Bostitch replacement part, it is sold individually.
The purpose of the AB-9051116 Pressure Reducer is to control the amount of air pressure coming out of the compressor tank.
This is helpful when inflating items to specified pressure.
Also some pneumatic tools use different air pressure specifications to make them operate properly.