These SWAGELOK 6L-8TW-9-S-0 90° 1/2" Ultrahigh-Purity Stainless Steel Tubular Fittings are in unused condition and are guaranteed to be fully functional. As seen in photos, there are markings on elbows that vary. For the green capped elbows there are a number that have SFF4 as well as SFF1. For the yellow capped elbows there are markings such as MaxPure and #822778. All elbows have ASME BPE markings. Please feel free to contact me with any questions.