Nebuliser - New Constellation - Portable (Stockport SK3)

This is an old nebuliser that was my late fathers. It's probably not been used for 10 years but still powers up, hard to test fully without oxygen! Needs a good clean and probably sterilising. As far As I can tell everything is there except the mask.

Have tried various charities etc but it's too old, seems a shame to just tip it.