Quartz Outer Tube for D-Torch. Compatible with Spectro (Ametek) Blue SOP/ARCOS II D-Torch (30-808-3614, 501907035). The D-Torch, provides a robust and high-performing alternative to both single-piece and semi-demountable quartz torches, ensuring greater robustness and 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 as per recommended guidelines, and store in original box.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001