This is an OEM replacement part and is sold individually.
Its propose is to deliver an electric current from an ignition system to the combustion chamber of a gas fueled engine.
It will ignite the air fuel mixture by the spark.
Spark Plugs will usually have to gapped to the manufactures specifications found in the owners manual.

Over time a Spark Plug will become fouled because the air/fuel ratio may be set wrong,worn piston rings, carbon build up and other factors.
It is better to replace a fouled spark plug, rather then trying to clean it.

Genuine Husqvarna replacement part, this item is sold individually.
This part is used on all of the Husqvarna Chainsaws listed below.
The purpose of this nut is to attach the Clutch Cover along with the Chainsaw bar.

Genuine OEM replacement part used with some Husqvarna Power Equipment. This item is sold individually. A spark plug is used to deliver electric current from an ignition system to an internal combustion engine. After time spark plugs will become dirty or fouled. It is a good idea to replace the spark plug once this happens. You should gap your spark plug according to the owners manual of the outdoor product you have.

Genuine Husqvarna replacement part, this part is sold individually.
The 503939601 Air Purge does just what the part name says.
It purges the air out of the carburetor.
Then it forces fuel from the fuel tank and fuel line in to the carburetor.

Genuine Husqvarna replacement part, this item is sold individually.
The purpose of the Fuel Tank Bushing is to create a seal and prevent leaks from the fuel tank. The fuel line are inserted in to the Bushing.
It is then pressed into the holes provided in the fuel tank.

This is an Authentic OEM sourced replacement part designed for use with Husqvarna Chainsaws. This is the Hose that delivers fuel from the Tank to the Engine. It is made out of Rubber and it is Sold Individually. Please note Fuel Filter is Sold Separately.