Loctite® 55™ Pipe Sealing Cord is a general purpose threaded pipe and fitting sealant. It is a non-curing, coated multifilament cord that seals out air and other common gases and fluids. It comes in a handy container with a built-in cutter to easily apply the proper amount of cord. Loctite® 55™ is recommended for sealing metal and plastic tapered pipe threads and fittings up to 4 in NPT. It has a temperature resistance up to 300 deg F.