The ball is the VACUUM RESERVOIR; The CLASS-C Ford chassis uses small RED PLASTIC tubing (inside black corrugated sleeves) to carry engine vacuum to firewall, then it changes to BLACK PLASTIC that goes to Reservoir and CHECK-VALVE, then black plastic through firewall to under-dash. Assume F53/ Class-A was originally similar. Small id (1/8" ID?) rubber hose works well to splice/ repair the plastics?
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
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