Rectorseal 31553 Brush Top Tru-Blu Pipe Thread Sealant, 1/2 pint Pipe thread sealant with ptfe is a fast-dry, flexible set thread sealant Designed for high vibration environments such as refrigeration and industrial applications It is also great for use as a positive lock and seal on threaded fasteners Stays flexible-designed for areas of high vibration and thermal expansion/contraction Low odor, non-separating, lead free and contains no metal