The Bowser bowl is nearly unbreakable, but those little glass pieces aren't indestructible, as much as we'd like them to be. Keep your shop stocked with replacement parts so your customers will know to come back to you when they need some help. These glass bowl inserts are screened with tiny holes for optimum airflow and to prevent debris from getting sucked into your mouth. 

These are replacement borosilicate screened glass insert bowls for the Bowser Travel Pipe.