This document describes several composite repair products from 3X Engineering, including TANKiT, REINFORCEKiT, PATCH, and REFLANGEKiT. REFLANGEKiT is a non-invasive system for repairing leaks in SF6 gas flanges online and under pressure. It works by encapsulating the flange in a double-shell system to collect leaks while resin is injected and cured, sealing the leak without disassembling equipment. REFLANGEKiT has been tested by EDF R&D and can repair flanges from -20°C to +65°C.