Normally Open Blue Cartridge for BV 21 tracks and for BV valves 26 tracksequivalent in reverse color to ref EMHART 59-27242 / 191-8273 / 191-7704 / 59-27616
Normally Closed Red Cartridge for BV 21 tracks and for BV valves 26 tracksreversed color equivalent to ref Emhart 59-27241 / 191-7705 / 191-8274 / 59-27677