Hi Mark: You got it. That tailpiece is a standard plumbing drain part that can be bought at any hardware. For plumbing purposes it may be packaged as an 1-1/4"; 1-1/2" that comes with a nylon washer that would fit it to your sink drain. I already had one but I had to go and buy the second one which I bought as just a 4" long x 1-1/2" diameter tailpiece at my local True Value Hardware. As I recall it was around 3 or 4 bucks. Hope this helps.
By the way while I think of it did you make any further progress with the mold you were working on in regards to that exhaust diaphragm for The Healthways Scuba?
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