REH-RMO: Orange Standard Duty Mining Hose. Operating temperature 0C to +50C REH-RMB: Blue Medium Duty Mining Hose. Operating temperature 0C to +50C REH-RMG: Green Heavy Duty Mining Hose. Operating temperature 0C to +50C REH-RMY: Yellow Heavy Duty Mining Hose, suitable for colder conditions. Operating temperature -10C to +50C