https://www.medicalgassupplier.com/bro_diameter/conductive-1-4-inch/https://www.medicalgassupplier.com/bro_diameter/non-conductive-1-4-inch/https://www.medicalgassupplier.com/bro_diameter/conductive-5-16-inch/https://www.medicalgassupplier.com/bro_diameter/non-conductive-5-16-inch/