This is a collar that attaches to MSA respirators in the same manner as MSA filter cartridges. It may be useful in adapting other types of filters onto these respirators. I'll be using it with the HEPA filter cartridges that belong to my vacuum cleaner.

Print instructions

The seal between the MSA respirator and this piece is the silicone body (blue in my photo) of the respirator. Printing with the sealing surface down against a smooth PEI build surface will minimize wear to the respirator body as the adapter is installed and removed.