Manufacturer's part #09 LSP 003. Their price: $118.00. This fits on the manufacturer's part #09 LSF 011 spatial filter. 3mm hole diameter, 23mm long. Threads are 12mm diameter. Looks like just a 3mm hole to us in a plastic housing. Not a clue how it relates to a 3 micro meter aperture per the manufacturer description and marked on the piece. Unused.
