Features and Benefits include: An alumina intermediate tube which resists wear and is tolerant to high temperatures Demountable outer tube With the D-Torch, you need only replace the outer tube Interchangeable quartz and ceramic outer tubes Interchangeable injectors choose the optimum injector for your application. Select from quartz for aqueous solutions, narrow bore for organics, wide bore for high dissolved solids or ceramic for HF O-ring free torch body for simplified maintenance and improved reliability