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No. It looks like a pawn piece from a chess set and is made of rubber with a slit on the rounded end.

It is a brass one.

Where can I get replacement air injector nipples? I have to clean mine every month or so and would like to have some spares for a fast swap.

Thanks for the prompt answer!

I have a MacClean softener and filter. I just changed the media in the filter and decided I should change the media in the softener as well. It's 25+ years old and never changed. It's a CS1500 and...