The attachment that the manometer fits on fits on any Aerobika. It’s a separate piece. I’ve interchanged it between my different Aerobika. I accidentally tossed mine out when I cleaned up my neb stuff. I have 3 Aerobikas and only bought the 3 rd one for the manometer. Has anyone had a luck buying just the manometer attachment? . So far no distributors I can find will sell it separately.