SEALEXCEL Well-lokTM Twin Ferrule Compression Tube Fittings have been carefully design and manufactured to close tolerances to provide leak-free performance in Instrumentation, process tubing etc. SEALEXCEL Well-lokTM Tube Fittings are type approved to ECE R110, ISO 1500, ASTM F1387-99 (2005), BS4368 part 4:1984, and Helium Leak Test. These Certificates confirms that SEALEXCEL Well-lokTM Twin Ferrule Tube Fittings meets the international specifications requirements for high quality products ensuring maximum reliability, consistency, safety and high performance.