Trap failure, however, is inevitable. After more than twenty years in service, the original traps began to lose their efficiency and pass steam or fail to vent. Worse, the delicate bellows required precise alignment within the trap body for a repair to be effective. Walter Barnes and Bill Jones recognized that the only way to properly maintain their traps was to pre-assemble and calibrate the repair kits at the factory. This one piece, calibrated repair kit was given the name “Cage Unit”.
