Kirk Enterprises Filter Ring 
SR-4

This metal ring is new in the bag.  I'm not sure what this is used for and searched everywhere to get specifics with no luck.  Any help on this one would be appreciated.

Please review the pictures.

The B81-23 in the listing title refers to my inventory location.

Let me know if you have any questions. Thanks for looking and please check out the many other great priced trains and collectibles in my eBay store - Mike's Express.

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