Small
Looking for a replacement jet for your T-108S?  This is it.
Perhaps you want a smaller diameter flow screw than the one that came standard with your Tucker? aluminum pole.  
This orifice is much smaller allowing those who want to preserve water to do so.
Addtionally you can get better performace from this jet when using a low flow system like RO/DI vs. DI only.
 
 
Large
This is the standard Tucker? pencil jets screw that would have came with your aluminum pole.
Large diameter for max flow.