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Main Valve

1. The core must have a readable producer number.2. The recycled core must be in line with the index of the purchased final product.3. The core must have a Knorr or Wabco nameplate, other manufacturers' cores will not be accepted.4. The core must not have mechanical damage caused by improper maintenance or disassembly of the old part: e.g. impacts, cuts, grinding, breakage, tanning.5. Returns must be complete, assembled, with no traces of disassembly or modification. No parts screwed or press-mounted, e.g. electronics, compression piston rods, plugs - unacceptable.6. The core must not be heavily corroded behind the outer part of the body, casting.7. Returned core may not show excessive oxidation on the outside of the body, casting.8. Returns may not show signs of excessive damage caused by excessive use or improper operation.