Screw-on valve RDC No mixed installation of 6 856 227 and 6 798 872 Contrary to the EPC identification, for retrofitted wheel and tyre sets the wheel electronics module 6 856 227 (orange) can be fitted. In case of replacement, an identical wheel electronics module, similar to the used part, must be used.,Screw-on valve RDC Contrary to the EPC identification, for retrofitted wheel and tyre sets the wheel electronics module 6 856 227 (orange) can be fitted. In case of replacement, an identical wheel electronics module, similar to the used part, must be used.