PneumaticPlus BM-28 Sintered Bronze Brass Exhaust Muffler 1/4" NPT HEX: 9/16" (Package of 10)
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I'm afraid I don't know because I've never used them in a vacuum. They do something similar with quiet pressurized air, which takes the edge off the noise a little, and I'm sure they do the same with vacuum. My main application is as a back purging TIG welding gas diffuser.
Selected User Reviews For PneumaticPlus BM-28 Sintered Bronze Brass Exhaust Muffler 1/4" NPT HEX: 9/16" (Package of 10)
These are installed on my compressor's exhaust and drain lines. It does a great job of reducing noise.
For their purging requirements, welders adore them.
I might add some cloth to the inside of the screen.
We now have four spares, which is ideal.
For the price, this is an excellent product.
My 125 psi 25 gallon tank went from a scream to a whisper after I quieted it down.
Now there's a lull! THEY REALLY DO MAKE A DIFFERENCE! Our equipment is now significantly quieter!.