The OV valve insert RTLH from Oventrop is a specialized replacement part designed for the reversed flow and return in the Unibox RTL. This product ensures reliable functionality and is ideal for use in radiator valves. The valve insert is equipped with an external O-ring seal, which allows for effective sealing. By using this valve insert, heating systems can operate more efficiently, leading to improved heat distribution and greater comfort. The item is sold as a single piece and is a valuable addition to any heating system that relies on the Unibox RTL. With this replacement part, you can ensure that your heating device operates optimally and achieves the desired temperatures.