What do I use to run the drip line for the condensation T? Consult with local codes. 3/8″ (1/2″ on DVC) high temperature silicon rubber tubing is recommended. Updated on April 19, 2021 Tagged: general Was this article helpful? Yes No Related Articles Changing Remote between F and C Clean or Change the Fan for a Pre-Mix Unit Clean or Change the NRC663 (EZTR40) Fan After Hours Will Call Pick Up Does Noritz offer a recirculation pump? Does a Noritz Tankless have a pilot light?