I inherited an old Henke Manufacturing Pacemaker air compressor. It was in a sad state of neglect, so I've done some work to get it back into working condition. To my knowlege the compressor I have was made in 1983 and the company has folded since then and parts have been a nightmare to find. I have everything up and running now, but there is one thing that still eludes me. I have never seen an intake "filter" (attached photo shows the filter in 2 pieces after removing a through bolt) that looks quite like the old one I pulled off the compressor. It may act as a muffler, but it looks like it's filtration abilities are dubious at best. I'd like to add a real filter, but I dont know how to go about sizing a replacement. The old filter plugs in to a 1 1/4" smooth intake and fastens with a set screw.
I don't want to restrict the air intake with a filter that is too dense, but that may not even be a realistic worry, and I don't want to thread the intake line unless I absolutely must. All of my past experience replacing compressor filters consists of find a part number and buying the appropriate replacement, so I'm not exactly sure where to begin my search. Any advice is greatly appreciated!
I don't want to restrict the air intake with a filter that is too dense, but that may not even be a realistic worry, and I don't want to thread the intake line unless I absolutely must. All of my past experience replacing compressor filters consists of find a part number and buying the appropriate replacement, so I'm not exactly sure where to begin my search. Any advice is greatly appreciated!

