Rectorseal 31551 1/2 Pint Brush Top Tru-Blu&nbsp;Pipe Thread Sealant 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