Permabond LH050 general purpose anaerobic pipe sealant is for use on metal pipe. Permabond LH050 is classified by Underwriters Laboratories Inc.® for use in devices handling gasoline, petroleum oils, and natural gas (pressure not over 300 psig) not exceeding 2 in. pipe size; propane and butane not exceeding 1 in. pipe size. Permabond LH050 is …Continue readingPipe Size Diameter and Thread Sealant Use