I friend asked me to measure my spare heater tees this morning because he was prepping for a trip and may have needed an alternative as a replacement to install prior to leaving. I thought I might as well post the info here for in case anyone else might need a quick reference to it.
Large tube O.D. - .670 / 17mm, outer lip - .730 / 18.5mm
Small tube O.D. - .555 / 14.1mm, outer lip - .595 / 15.1mm
Large tube O.D. - .670 / 17mm, outer lip - .730 / 18.5mm
Small tube O.D. - .555 / 14.1mm, outer lip - .595 / 15.1mm