T-U TYPE 555 is a yellow soft-set, odor free, all purpose, non-seizing, thread sealing compound that produces a leak proof seal on all types of metal and plastic threaded connections. T-U TYPE 555 is completely homogenized and free of any valve destroying grit. Temperature Range Use: -50°F (-45°C) to 400°F (+204°C). Non-Separating Grit Free Paste Adheres to Oily Threads Easy Cleanup Safe for PVC & CPVC Nontoxic/Non Combustible