Red X-Treme Tape.

• Resists extreme environments; won't melt up to 500° F; remains flexible to -60° F
• No adhesive; fuses only to itself
• Forms a water-tight and air-tight seal
• Tensile strength of 600 psi
• Insulates to 400 Volts/Mil
• Tight insulating tape is 1" wide x 10' long and stretches to thee times its length