I ordered some new bicycle tubes and repaired it myself, not difficult at all. All you need is a new tube, rubber bands and some construction adhesive. Once you pry the top off you'll see how easy it is to fix..
Townshend Audio Seismic sink repair
I have a Townshend seismic sink HD-1 (2 holer) that has a collapsed lung on one side ... it will not hold any air on the one side, and there is a warning on the bottom about the product releasing some sort of chemical if opened ... I have e-mailed Townshend, with no response ... Does anyone know of someone who repairs these things ? ... thanks in advance.