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Parts & Accessories Questions
　

What is an O-Ring?

  
 
An o-ring is the thin rubber ring that is usually at the top of a housing. It looks like a tiny hula hoop. It is used to seal the cap (top) and the sump (bottom half) of the housing.

O-rings are sometimes referred to as gaskets.
 

What is a gasket?

  
 
A gasket is a thin rubber piece that is often part of a filter cartridge. A gasket looks like a frisbee with a hole in it. Gaskets help the cartridge seal to the housing.

Gaskets are sometimes referred to as o-rings.
 

Do I need a new O-Ring?

  
 
Some people like to change O-Rings every time they change their filters to ensure that there will not be a leak. Others change their O-Rings only after changing the filter several times.
 

Should I use a lubricant on my O-Ring?

  
 
If you choose to reuse your o-rings, you should use a lubricant on them to keep them effective. You can use a special silicone lubricant such as this O-Ring Silicone Grease.

First, wipe your old O-Ring clean. Then wipe the groove in the filter housing clean. Finally, apply just enough lubricant on the O-Ring to give it a gloss.
 

Do I need to lubricate the gasket on the filter cartridge?

  
 
Generally, no because each replacement filter cartridge comes with its own new gasket.
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