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Koch Multi-Test cartridge filters — the OEM cartridge replacement line for industrial dust collection, gas turbine inlet, and specialty cartridge-housing applications. Multi-Test MT standard cartridges, Multi-Test Rigid heavy-duty cartridges, and configurations cross-referenced to common OEM spec sheets across Donaldson, Filter1, Camfil, and other industrial cartridge platforms. Cross-referencing is part of our service: if you have an OEM model number from a piece of equipment that nobody else will quote, send it to us with dimensions and we'll route it through Koch engineering to identify the equivalent Multi-Test SKU.