pescador775
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It was fairly simple to modify my Bristol (American Bristol 4 cfm) type cartridge and involved a bit of luck. The cartridges are each composed of three parts, 2 plastic end caps glued to a plastic tube. I bought a section of 2 inch aluminum tube and cut sections to replace the original plastic. Just a matter of inserting the plastic caps into the new aluminum tube. Now, they slide perfectly into the aluminum with the lips of the caps set on O rings, no glue involved. Later, I looked to increase the capacity and was able to find another cubic inch. I did away with the bottom cap which took up some space due to the fins on the bottom. An aluminum disc was cut with a hole saw, then drilled and soldered (alumaloy) to the tube. My setup really did not need the fins anyway. Essentially, they are a stand-off to reduce spray getting into the cartridge. I suppose that could be a problem if used in the original setup, eg a hybrid filter responsible for moisture separation and final filtering. My portable compressor, on which the Bristol hybrid canister is mounted, includes a separate moisture separator so no neat water shows up in the hybrid. I don't care much for hybrids but the little coalescer in the bottom is there if needed. My personal practice and philosophy is to install two separate components, one for moisture condensation and the other for chemical filtering. I don't like these to talk to each other, either; that is except when the machine is actually operating. Otherwise, any communication involving movement of water vapor from one to the other is death to the chemicals.
