Absolutely amassing display of glass blowing skill. Marv you're an accomplished model builder. In your opinion what would the be scale of difficulty in making the valve and its components without the use of a precision lathe if you were to try an make them out of any type of metal let alone having to deal with any material as fragile and as hard as glass?
I've watched several accomplished glass blowers and artisans make beautiful figurines vases long tubes and many other things but never anything like this.