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Technical Bulletin Bulletin No: PRO-01-24 Subject: Effective Date: 11/15/82 Cancels: NA Page: 1 of 1 UNLOADER DESIGN CHANGE TUFLO 400, 500, 501, 600, 700 AND 1000 COMPRESSORS A change in production techniques allows the elimination of the teflon back-up ring on TuFlo 400, 500, 501, 600, 700 and 1000 Compressor unloader pistons. Performance, durability and interchangeability are unaffected. This will be phased in on a running change basis in the near future on new and remanufactured compressors and unloader kits 279614 and 279615.