If the apparatus does not have a regulator and does not have a filter, I presume you may be on the lookout for purchasing a regulator/filter combination to put in line with the jar, yes? (Personally I cannot help you here). But if you are trying to reason with the department that a regulator and filter are necessary and should be provided, then surely they would appreciate ( ih these modern times) that from the filter point alone, it is critical that infectious debris does not have any chance at all of getting into the pipeline sytsem even though they may, in all the years of use, never have had an accident so far. From a point of infection control alone a filter is essential. As far as legislation is concerned, I would be surprised if there is anything to say that a regualtor complete with filter is required, but may well be stated that an in-line filter(and regulator?) is mandatory in a ward suction apparatus.
