Real-Tuff 15605 PTFE Paste Thread Sealant Multi-purpose, heavy-duty thread sealant for use on all metal and plastic pipe fittings, including CPVC. Provides leak proof hydraulic resistance to 12,000 psi. For temperatures from -200 to +550 degrees F. Withstands gas pressure up to 2,600 psi. Non-toxic, Contains No LEAD