Testudo Bubbler

Has a 10 mm Diameter hole at top for a bowl at the top, smoke through the nose and mouth.

I'd recommend using a pipe fitting with a screen for the bowl;

pipe socket
http://www.amazon.com/gp/product/B000BO9CJ0?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s01

and a brass screen
http://www.amazon.com/Stainless-Steel-Tobacco-Pipe-Screens/dp/B00K9D05D0/ref=sr_1_6?ie=UTF8&qid=1443568334&sr=8-6&keywords=brass+screens