Plumbing - Pipe Insulation PEX
Used to insulate hot water pipes inside the house so the hot water comes out of the faucet hot even after not using for a while.
3/4 inch
https://www.lowesforpros.com/pd/Frost-King-0-75-in-x-6-ft-Foam-Plumbing-Tubular-Pipe-Insulation/3133245 $1.25 for 6 feet
1/2 inch
https://www.lowesforpros.com/pd/Frost-King-1-2-in-x-6-ft-Foam-Plumbing-Tubular-Pipe-Insulation/3133243 $1.00 for 6 feet