Replacement of disposable lid

DeVilbiss was by itself, then I think Sunruse Medical bought them out, then they're back as their own company. Anyway, here is the url to their 7305 line..

http://www.devilbisshealthcare.com/products/suction-therapy/homecare-suction-unit 

Double-check which model number you have from the chart on the left, then underneath, in the literature section, 3rd listing is the replacement parts listing.

"Have fun storming the castle!" (from "The Princess Bride")

Thank you SO much for your very helpful information, Ray!  

Thank you Ray for chiming in to help assist Jill with this.