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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.
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.
The purpose of the 678169004 Thermal Relief Valve is one of safety.
In the event that the water in the pump continues to circulate without being discharged, the Thermal Relief Valve will open and release the water and pressure from the the pump so it will not be damaged.
By pressing on the primmer a few times this assembly fills the carburetor with fuel.
When the carburetor has enough fuel in it, the excess fuel is forced back into the the tank through the fuel return line.
After time the primer hose will become brittle and crack and have to be replaced.
The primer will also lose its elasticity, and may also crack and not be able to suck up the fuel into the carburetor.
And will have to be replaced.
Mulching blades have a more curved style surface and frequently include extra cutting surfaces along the blade edges.
This blade is designed for all the models listed below.
If used correctly with the mulching plug that is inserted into the mower, the clippings will stay under the deck longer and get re-cut.