Side feed cup gasket

Kingpin

AKA, SIR KingPin
Staff member
Mod
I have just seen the gaskets that fit into the bottom of the Iwata side feed cups for sale, and was wondering if they are actually needed to help with performance? I have 2 Iwata's and a badger side feed and none have the gaskets in them, so should I buy some?

These are the ones I mean
 
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