Thermwell Products 4 Pack 3' Black Tubular Polyethylene Foam Pipe Insulation, designed to effectively insulate your 3/4" copper pipe nominal size, or 1/2" iron pipe. This non self-sealing insulation, with a 1/2" wall thickness, is pre-slit for easy installation. It helps prevent heat loss, reduces condensation, and saves energy, making it a cost-effective solution for your plumbing needs.