Zippertubing has been building quality products and solutions since 1957 image Building Quality Products & Solutions Since 1957


PRT® is a wrap-around, heat-shrinkable tubing that provides a means of adding additional insulation to an assembled wire or cable. PRT® can be used to protect in-service electrical systems without the need to remove or disassemble the associated connectors and end hardware. This product is also a great in-service repair tubing where a side-entry installation is required.

A heat gun is used to recover the material in a fashion similar to standard, non-split, heat-shrinkable tubing. This material has an operational temperature range of -55° to 135°C (-67° to 275°F).

PRT® (ES-135)

Drawing No. ZT03-04-010

Part No. ZT03-04-010-01-X600.0

NSN No. 5970-01-611-7759

Our proven PRT® heat shrink wrap with additional hot-melt, water-blocking adhesive (up to 275°F)

  • Available in six color options and a multitude of diameters with National Stock Numbers (NSN)
  • Never disconnect or pull through another wire or cable again and water block it
  • Excellent-anti abrasive, environmental, chemical, and electrical properties with resistance to most oils and fluids, mild acids, and alkalis

Cable Diameter - After Shrinkage




PRT® (ES-135) is specifically engineered to provide water blocking to your wires or cables.

This product combines the proven characteristics of two products, our PRT® wrap-around heat shrink tubing and our water-blocking, hot-melt adhesive Z-Block® (135). Together, these two products provide one of the best ways to fix an in-service repair, and offer complete 360° protection against anything that the environment may throw at it.

Z-Block® is a water-blocking, heat shrink electrical tape that is specifically engineered to environmentally seal your wires or cables. The product is comprised of a non-corrosive polyamide, high-flow, hot-melt adhesive that is simply melted by using a standard heat gun.

PRT® is made from MIL-SPEC polyolefin heat shrink tubing that is flame-retardant, RoHS-compliant, and UL-rated. This product is a wrap-around heat shrink that provides a means of repairing in-service, pre-installed applications where wires or cables may be damaged. It can be used as a secondary protection installation for applications that require additional protection.

PRT® (ES-135) has an operational temperature range of -55° to 135° C, and the product is available in 50-ft. rolls and a variety of diameters.

Either of these products is available as a stand-alone product. If you do not see your application’s needs in a solution, feel free to contact us. We would be happy to engineer a specific solution that will fit your needs.


  • This product offers many sizing variations with National Stock Numbers (NSN)
  • Available in many different colors, and comes in a standard, 50-foot roll
  • Custom options may be available upon request


  • Utilizes a non-corrosive polyamide, high-flow, hot-melt adhesive to water block wires or cables
  • Heat shrink is made from MIL-SPEC tubing that is flame-retardant, RoHS-complaint, and UL-rated

Related Products

Product Specifications

RoHS Compliant
Shelf Life 24 months
Minimum Operating Temperature -67 ° F (-55 ° C )
Maximum Operating Temperature 275 ° F (135 ° C )

Available Attributes

Please contact us for custom needs. We have a solution for you!

Shape of Installation Round
Cable Diameter - After Shrinkage 0.040" - 0.075" (#01) 0.076" - 0.125" (#03) 0.126" - 0.174" (#05) 0.175" - 0.250" (#07) 0.25" - 0.37" (#09) 0.38" - 0.49" (#11) 0.50" - 0.62" (#13) 0.63" - 0.74" (#15) 0.75" - 0.87" (#17) 0.88" - 0.99" (#19) 1.0" - 1.12" (#21) 1.13" - 1.24" (#23) 1.25" - 1.37" (#25) 1.38" - 1.49" (#27) 1.50" - 1.62" (#29) 1.63" - 1.74" (#31) 1.75" - 1.87" (#33)
Unit Length 50 ft. Roll
Exterior Material Polyolefin Heat Shrink
Closure Adhesive
Environmental Seal Z-Block-135

Specifications subject to change without notice. All statements and technical information contained herein are based on tests we believe to be reliable, but the accuracy or completeness is not guaranteed under all circumstances. Before using Zippertubing® products, the user shall determine suitabilituriy for the intended use, and user assumes all responsibility for improper selection. Published attenuation values of Zippertubing® shielding have been verified by laboratory testing of the respective shielding materials. Actual installed attenuation values may differ due to installation techniques and final assembly operation parameters which are beyond the control of Zippertubing®. Actual attenuation values can only be determined by the end user testing the completed assembly. U.S. and International Patents and patents pending. © 2019 The Zippertubing® Company, Chandler, Arizona.

Speak to an Engineer Today!

We have highly experienced and friendly engineers on site ready to assist you in all your projects.