Quartz Outer Tube for D-Torch. Compatible with PerkinElmer Avio 200/500 Series ICP-OES D-Torch (Avio 200: 501907038; Avio 500: 501907039). The D-Torch, provides a robust & high-performing alternative to both single-piece & semi-demountable quartz torches, ensuring greater robustness & a lower cost of ownership. With the D-Torch design, the analyst most often replaces only the outer tube, rather than replacing the entire torch or a quartz torch body.When not in use, clean per recommended guidelines, & store in original box.If analyzing high salt, fusions, wear metals in oil, hydrofluoric acid (HF) or volatile organics, we recommend ceramic outer tube P/N 501907262 or 501907267, which does not devitrify or crack from thermal shock, like quartz. Compared to quartz outer tubes, the ceramic alternative has an extended lifespan, significantly reducing maintenance, cleaning, & downtime caused by torch failure.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001