As the first manufacturer of progressive valves in Iran, Coop has been able to bring Iran to the same level as the best manufacturers of valves in the world in terms of sanitary valve production techniques. The most complex type of cartridge in the world has been used in the production of the Aran model valve. This valve directs water from cold to hot with a progressive cartridge at constant pressure. The circular surface of this valve has been polished by a CNC lathe. In the design of this valve, the light reflection on its handle is reminiscent of a gramophone record.​