Thermwell Products P11 Foam Insulation, 3-Feet, 4-Pack 3-Feet Black. Tubular. Polyethylene Foam Pipe Insulation Helps To Prevent Pipes From Freezing Or Sweating Pre-slit, With Heavy-duty 5/8-Inch Wall Thickness For Use On 3/4" Copper or 1/2 " Iron Pipes Four 3 foot pieces Comes With 4 To A Pack