<https://www.liwts.org/product/sheldon-black-basic-glass-bubbler/#product>
<http://schema.org/description>
"Basic Glass Bubbler by Sheldon Black\r\n\r\nThis is the basic bubbler in the range but still comes complete with a 16 hole diffuser and made from the same high boroscilicate glass and with the same care and skill as all the other pieces in the Sheldon Black range."
<https://www.liwts.org/product/sheldon-black-basic-glass-bubbler/>