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PAD ADAPTERS
           
 
    
Adapters can be found in many of the spa filter cartridges.  Most of these adapters can be removed from the filter cartrdige and reused.  These adapters are used to secure the filter cartridge into the spa. 
 
The adapters will have different threads in the bases.  The type of thread is determined by looking at your old filter or checking your manufacutrer's owner's manual.
 
Threads will be called:
MPT = Male Pipe Thread (this is the smaller thread)
 
SAE = Wide Threads