Answer: The Acapella DH is intended for hospital use and does not come apart. The pressure dial is set by the hospital doctor, and as intended, it cannot be turned and adjusted by the patient. The Acapella Choice, also green but with slightly clearer plastic, is for hospital and home use. It easily comes apart as online videos demonstrate and the pressure dial can be turned to let you adjust it. Both units are green, most online Acapella resources don't distinguish between these two different models, and there are very few online resources specifically about the Acapella DH.
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