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Zareba® Small Ceramic Lag Screw Insulator

Model #: WP1933

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  • Screw-on ceramic insulator, will last the lifetime of the fence
  • Prevents electrical shorts between the electrified wire and the fence posts
  • Designed for use with wooden posts
  • Use with all fencing wire, including high tensile and polyrope
  • Comes ready-to-use, 1 insulator per box

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Zareba® Small Ceramic Lag Screw Insulator Prevent electrical shorts with the help of this Zareba® Small Ceramic Lag Screw Insulator. This lag screw insulator is made from durable ceramic and is designed to prevent electricity from flowing out of the fence into the post, ensuring that your electric fence operates at full capacity. Designed with durability and strength in mind, this lag screw insulator works with high tensile fence systems.
Ceramic Lag Screw Insulator
Secure Wooden Posts
Secure Wooden Posts Attach your fence wire to wooden posts with this small ceramic insulator. While wood itself is nonconductive, water does conduct electricity, and if your fence posts become damp or wet, energy from the fence may be transmitted into or through the post. Insulators help to prevent the loss of energy in this fashion.
Usable with Any Fence Wire This ceramic lag screw insulator is suitable for use with traditional fence wire including high-tensile, polywire, polyrope, and 1/2" and 1" polytape. Simply screw the Zareba® Lag Screw into the fence and feed the wire through the ceramic head. The head acts as a barrier between the wood and the wire, preventing any possible transmission of electricity through the wood.
Keep Electric Fence Working Effectively
Zareba® Small Ceramic Lag Screw Insulator Product Details Do you want to know more helpful details about the Zareba® Small Ceramic Lag Screw Insulator? Take a closer look at the in-depth specifications for this product. Complete Product Details »
Zareba® Small Ceramic Lag Screw Insulator
Model # WP1933
Material Ceramic
Post Type Wood
Count Per Box 1
About Zareba® Zareba® joins ElectroBraid® and Fi-Shock® to form the largest manufacturer of electric fence systems in North America. Our company offers durable, reliable electric fence products for all your pet and livestock fencing needs. Since the 1930s, Zareba® and its related brands have been leaders in electric fencing, providing for homes, farms and ranches. If you have questions about your electric fencing purchase, reach out to Zareba® Service Experts for assistance.
WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

Model # WP1933
Material Ceramic
Post Type Wood
Count Per Box 1
Use With Aluminum wire, steel wire, high tensile wire, polywire, polyrope, 1/2" and 1" polytape

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 12, 2016
fast shipping! By VickiKay
we had a problem with the insulators we were using leaking.. these solved the problem
Read All Reviews (1) Write a Review
Q.Could you please tell me the minimum hole size diameter of this insulator and the other porcelain insulators you sell similar to this #1933 that have threaded lag to fasten to a wood post.. Thank You

The diameter of this hole is approximately 1/2" wide. Many of the similar insulators are going to be the same size. Please feel free to contact our Consumer Relations Team at 1-855-5-ZAREBA (1-855-592-7322) for more information on other insulators.

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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»

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