Zareba® Duralator – Wood Post Self-Drilling Insulator

Model #: IWSD-Z

1 reviews
0 5 5

Notify me when this product is in stock.

Reward Points with My Account Learn More »


  • Large self drilling, screw-in insulator for wooden posts
  • Can be used with steel wire, aluminum wire, polyrope and polywire. (Not recommended for polytape.)
  • Installs easily & quickly - 10 seconds
  • 1 insulator per order (White)
  • Service Experts Available To Answer Your Installation Questions

Buy this item in Canada »

Zareba® Duralator Wood Post Self-Drilling Insulator

Do you need a way to attach electric wire to a wood post while still maintaining the current and avoiding energy loss? The Zareba® Duralator Wood Post Self-Drilling Insulator can help you accomplish all of this with ease. The Duralator is a self-drilling, screw-in electric fence insulator that can be used with many different wire types, including high tensile wire.

The Duralator is manufactured from sturdy plastic that can outlast porcelain insulators. You’ll also appreciate the attractive white color that can enhance the aesthetics of your property by adding a professional touch. You can install the Duralator in only 10 seconds with power tools.

Key Zareba® Duralator Features and Benefits

  • Helps to prevent short circuiting
  • Includes unbreakable polycarbonate plastic construction that’s as tough as steel
  • Promotes uninterrupted current flow while eliminating energy loss
  • Is compatible with multiple types of electric wires
  • Is an ideal choice for longer farm fence lines

Why Choose Zareba® Insulators? Reliable Zareba® electric fence insulators such as the Duralator will maximize the performance of your farm fence. By preventing shorting and energy loss, our fence insulators will provide continuous current flow while also giving you the peace of mind knowing you don’t have to worry about perimeter breaches. Zareba® electric fence insulators are also designed to withstand the rigors posed by the most challenging environmental conditions. You’ll experience superior performance throughout the year, regardless of what Mother Nature sends your way.

Benefits of Using Plastic Insulators In addition to polycarbonate plastic insulators such as the Duralator, Zareba® manufactures insulators and farm fence supplies made from nylon and polyethylene. These materials are renowned for their ability to secure electrified wire in place while minimizing energy loss. Plastic insulators are equally compatible with all types of wire, making them a flexible and versatile wire attachment alternative. All Zareba® plastic insulators are made in the USA, and they are backed by more than 25 years of electric fence expertise. Protect your perimeter with the help of the Zareba® Duralator and electric fence supplies!

Zareba® is the largest manufacturer of electric fence systems offering durable, reliable electric fence products for all of your animal fencing needs.


Zareba® Duralator – Wood Post Self-Drilling Insulator - Specifications

  • Large self-drilling, screw-in insulator for wooden posts
  • Can be used with steel wire, aluminum wire, polyrope and polywire. (Not recommended for polytape.)
  • Comes in white color porcelain look
  • Can be installed with a power tool
  • Installs easily & quickly - 10 seconds
  • Can be used with high tensile
  • As strong as steel, more durable than porcelain

Disclaimer: Zareba® System does not endorse any information contained in product reviews. Please follow all label instructions for your specific use.

Most Recent Customer Reviews

Review Rate
Review posted on
September 15, 2014
Amazon Review By
Love these things, use a ratchet to install. Easier than other insulators to install.
Read All Reviews (1) Write a Review

There are no entries.

Ask Your Own Question
  • Yes, sign me up for an eNewsletter subscription so that I can receive information about products, enhanced services, exclusive sales and other special offers.

  • Reload captcha

* Required Fields

All About

All About Insulators

Insulators prevent electrical shorts between the electrified wire and the fence posts. Good-quality insulators are critical to a properly functioning fence. Insulators are made from materials that do not conduct electricity, most commonly plastic or ceramic.


Plastic insulators are molded from polyethylene, polycarbonate, or nylon and are designed to hold electrified wire near a variety of posts without losing energy through the post.

There are several styles to choose from because the insulator must match both the type of wire and the type of fence post being used. Plastic insulators include round post insulators, T-post insulators, wood post insulators, corner post insulators, end post insulators, and chain link fence insulators.

Make sure the plastic insulator you choose is molded from heavy-duty, high-density polyethylene (or harder plastic) with UV inhibitors. This prevents arcing and provides long life with all-weather performance, protecting it from the weather. Most insulators are available in yellow, black and white.



Like plastic insulators, porcelain insulators are designed to hold electrified wire near fence posts without losing energy through the post.

When good porcelain insulators are properly installed they should be able to last the life of your fence.

Porcelain insulators are a very good choice for using with your high tensile fence system.



There are specialized insulators that are used for specific purposes. These can be summarized as follows:

Tube Insulators

  • The tube clamp insulator attaches to standard tube-type stock to corral panels.

Corner Insulators

  • Corner post insulators are designed to withstand fence line tension generated by the fence line pulling from the anchor point or changing directions.
  • Corner insulators should also be used at fence line termination points.
  • Corner post insulators are available in plastic and ceramic, accommodating steel wire, polywire, polytape & polyrope.

Specialty Insulators

  • Other insulators allow you to fasten electrified wire or poly products to posts and fences without losing energy through the post or fence.
  • There are many specialty insulators to choose from:
    • Chain Link
    • Tube
    • Corner
    • U-Post
    • Square Post

Benefits and Considerations of High Tensile Fencing

High tensile fence is an excellent choice to safely contain most species of livestock, including various exotic species. It is also equally effective keeping unwanted predators, deer or other wild animals out.

High tensile is an affordable, low maintenance permanent perimeter fence, lasting over 40 years. It works as a simple barrier fence or can be electrified for greater effectiveness and animal safety.

The key to a successful high tensile fence installation is advanced planning, combined with proper tools and quality materials.

We recommend Zareba® high tensile components, which are rugged, reliable and designed to withstand harsh environmental conditions, providing long life for your fence.

Zareba® has developed high tensile videos to help design and build your high tensile system. Once you build a high tensile fence you won't want any other type of fencing system.


Expert Tips

Insulators come in many styles to accommodate a wide variety of post and wire types. Choose the correct type of insulator for the type of post and wire you've selected.

If you're using a low impedance fence charger, use an insulator with greater arcing protection, which will prevent the current from jumping to the fence post.

Porcelain insulators may be more expensive than plastic insulators, but they are designed to last a long, long time, usually the lifetime of your fence!

Plastic insulators can be used with all types of wire (and high tension if it is designated for it), while porcelain insulators can be used with all wires except for poly tape.

Corner posts and end posts have to withstand greater tension than other posts along the fence line. Therefore, use insulators at these areas that are designed to withstand the extra stress.

In addition, keep insulators free from dirt, dust and cobwebs.


FAQs About Insulators

Q: Do I need insulators for my electric fence system?

A: Insulators allow you to fasten electric wires near the posts without losing energy through the posts and potentially shorting out your system, so yes, definitely use insulators to maintain the current throughout your fence line.


Q: Which type of insulator should I use?

A: There are several factors to consider when determining which type of insulator you want for your electric fence system. These factors include the type of fence post you will be using, and the type of wire you will be using. For corners and end posts you will need to know how much tension you plan to have on the wire.


Q: Is a porcelain insulator better than a plastic insulator?

A: Porcelain insulators are used with high tensile fences as well as standard electric fences. They will last the life time of the fence and add a nice look to the fence. Their only drawback is their initial cost: Porcelain insulators usually cost more than plastic insulators.

Insulators made from plastic are generally used for standard electric fences only, although there are some designed for use with a high tensile fence.

More Insulator FAQs»

Recommended Products

Cookies On This Site Ok This site uses cookies to improve your user experience. By using this site you agree to these cookies being set. To find out more see our cookies policy.