RS2 column radiators are manufactured in the USA from cold-rolled steel. The column radiators are finished in a gloss powder coat and available in many standard colors and over 100 optional colors. They are available in 2″ increments from 6″ to 240″ long in each of six heights. Standard NPT connections are 1/2″ for supply and return piping and 1/8″ for vent fitting.