To help with online shopping during COVID-19, we are offering free shipping on all orders.

Zareba® Yellow Screw-On Insulator

Model #: IRY-Z

4 reviews
0 5 2.5

Reward Points with My Account Learn More »


  • Screw-on insulators
  • Fits all posts 1/2 inch in diameter or smaller
  • Completely arc-proof
  • 25 insulators per bag (Yellow)
  • Service Experts Available To Answer Your Installation Questions

Zareba® Yellow Screw-On Insulator

Looking for an insulator to fit your smaller posts?

Our Zareba® Yellow Screw-On Insulator fits all posts 1/2 inch in diameter or smaller. It is completely arc-proof.

Packed 25 per bag.

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


Zareba® Yellow Screw-On Insulator - Specifications

  • Screw-on insulators
  • Fits all posts 1/2 inch in diameter or smaller
  • Completely arc-proof
  • Packed 25 per bag
  • Color: Yellow

Disclaimer: 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
November 19, 2019
Hope Zareba goes back to the old insulators!! By Dennis

Got a few more bags of these hoping they would be better (did not have a good experience previously) but they were not. Nut is hard to screw on, insulator does not sit on the post very well, they break easily and being from the Caribbean they don't last long in the sun. Really wish Zareba would go back to the old style insulators. They did they job perfectly and stood up quite well in the sun. P.S. not sure if anyone else got this problem but in a few of the bags there were 25 insulators but 2-4 nuts were missing.

Response From Woodstreambrands
Kathryn : Consumer Relations Representative

Thank you for sharing your experience. We would like to know more. Please contact our Consumer Relations Team directly at 1-855-5-ZAREBA (1-855-592-7322) for assistance. We're happy to help.

Review Rate
Review posted on
November 11, 2019
the plastic isn't as strong as your older one or your black ones. By lee

your yellow screw on insulators don't last very long they breaking . they are not like the old yellow and black plastic insulators, in one year they fail, the plastic doesn't seam as strong,

Response From Woodstreambrands
Lauren : Consumer Relations Representative

Thank you for taking the time to share this feedback. We apologize that the insulators have been breaking and would like to learn more. Please feel free to reach out to us at 1-855-5-ZAREBA (1-855-592-7322) for assistance.

Review Rate
Review posted on
October 15, 2019
Hard to screw parts together By Mike

Picked up two bags of these and it was a struggle to get the plastic nuts to screw on to the base. Some of them we gave up on completely. Hopefully this isn't the normal experience for others as it made putting up the fence painfully slow.

Response From Woodstreambrands
Kathryn : Consumer Relations Representative

Thank you for your feedback! We would like to know more about your experience. Please contact our Consumer Relations Team directly at 1-855-5-ZAREBA (1-855-592-7322) for assistance.

Review Rate
Review posted on
December 11, 2018
Great Product By JP

Best round post insulators I have found thus far. These really hold up year to year, I have used some that fail within a few months.

Read All Reviews (4) Write a Review
Q.Will this work with 1/4in poly rope? If not, what insulator for 1/4in poly rope do you suggest for use with 1/2in rebar posts? Thanks!

Yes, this insulator can be used with poly rope.

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 and accommodate steel wire, poly wire, poly tape and poly rope.

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

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.