Arlington Weatherproof Clamp-O...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16,515.38
Arlington Industries 4" Aluminum Entrance Cap - Clamp-On Type for Rigid, IMC and EMT Conduit

Arlington Weatherproof Clamp-On Entrance Cap for Conduit - Aluminum, Fits Rigid & EMT, UL/CSA Listed, 100 Pack

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Model: 149

In Stock (leaves warehouse same day if ordered before 3pm ET)

$16,515.38
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Arlington Industries 4" Aluminum Entrance Cap - Clamp-On Type for Rigid, IMC and EMT Conduit

Professional weatherproof protection for electrical conduit systems

Arlington Industries delivers reliable conduit protection with this 4" aluminum entrance cap designed for clamp-on installation on rigid, IMC, and EMT conduit systems. This UL and CSA listed entrance cap provides professional-grade weatherproof sealing in a durable silver aluminum construction, ensuring long-lasting performance in demanding electrical applications.

Professional Features & Benefits

  • 4" Size Compatibility: Precisely engineered for standard 4-inch conduit applications, ensuring proper fit and reliable sealing performance.
  • Aluminum Construction: Corrosion-resistant aluminum material provides exceptional durability and longevity in outdoor and harsh environment installations.
  • Clamp-On Design: Secure attachment system accommodates rigid, IMC, and EMT conduit types without threading requirements for versatile installation options.
  • UL and CSA Listing: Meets rigorous safety and performance standards for code compliance and professional electrical system integration.
  • Silver Finish: Professional appearance with enhanced corrosion resistance for long-term aesthetic and functional performance.
  • Weatherproof Protection: Engineered sealing design prevents moisture and debris infiltration to protect electrical connections and conduit integrity.

Technical Specifications

  • Color: Silver
  • Listing: UL, CSA
  • Material S: Aluminum

Professional Applications

  • Commercial Building Electrical Systems
  • Industrial Facility Conduit Protection
  • Residential Service Entrance Applications
  • Outdoor Electrical Installations
  • Municipal and Infrastructure Projects
  • Maintenance and Retrofit Applications

Why Choose Arlington Industries Quality?

Arlington Industries entrance caps deliver proven reliability through UL and CSA listing compliance and robust aluminum construction. The professional silver finish and engineered clamp-on design ensure dependable weatherproof protection for critical electrical conduit systems across diverse installation environments.

Manufacturer Resources

Product Specs

Listing:
UL, CSA
Department:
Electrical
Product Type:
EMT Fitting
Product Category:
Conduit Fittings
Product Color:
Silver
Product Material:
Aluminum
Product Group:
Mast Parts

Arlington Industries 149 – Frequently Asked Questions

1) What conduit sizes does the Arlington clamp-on entrance cap come in?
Arlington's aluminum clamp-on entrance cap is made in five trade sizes: 1-1/2 inch (part 144), 2 inch (145), 2-1/2 inch (146), 3 inch (147) and 4 inch (149). Order by the trade size of the mast or conduit you are capping, not by the outside diameter of the pipe. Sizes 1-1/2 and 2 inch cover most residential overhead services; 2-1/2 through 4 inch are the sizes that show up on commercial risers and larger multi-family service masts.
2) Will an Arlington clamp-on entrance cap fit EMT, or do I need threaded rigid conduit?
It fits both. The clamp-on design grips the outside of the conduit instead of threading onto it, so the same cap works on rigid, IMC and EMT of the matching trade size. That is the practical reason to pick a clamp-on over a threaded service head: EMT has no threads to take a threaded cap, and on a cut length of rigid you would otherwise have to field-thread the end. Match the trade size and you are done.
3) Is the Arlington entrance cap UL listed for a service mast inspection?
Both UL and CSA Listed. That matters on a service entrance because the inspector is looking for a listed weatherhead on the mast, and the CSA side means the same part number is acceptable on Canadian jobs without sourcing a separate SKU.
4) Is an aluminum entrance cap OK outdoors in a coastal or industrial environment?
Aluminum is the body material here, which is why it is the standard choice for an exposed weatherhead sitting on a mast in the weather year round. It does not rust the way a plated steel fitting will once the coating gets scratched during install. The silver finish is the mill aluminum itself, so there is no paint layer to fail.
5) What is the difference between a clamp-on entrance cap and a threaded service head?
A threaded weatherhead screws onto the threaded end of rigid or IMC and can only go on threaded pipe. A clamp-on cap like this Arlington aluminum cap slips over the conduit and clamps to the outside, so it works on rigid, IMC and EMT alike, and on cut ends with no threads. Choose threaded when you have a factory-threaded rigid riser and want the mechanical connection; choose clamp-on when the run is EMT, when the pipe was cut in the field, or when you are replacing a head on an existing mast and do not want to pull and rethread the conduit.
6) Can I replace an existing weatherhead on a 2 inch mast without taking down the conduit?
That is what the clamp-on style is for. Because the cap clamps to the outside of the pipe rather than threading on, a 2 inch mast takes the 145 and you are working only at the top of the riser. Confirm the trade size of the existing mast first, since the cap is sized per pipe and does not adjust between sizes.
7) I am standardizing weatherheads across a portfolio of buildings. Can I stay on one Arlington part family for every mast size?
Yes, one family covers it. Parts 144 through 149 span 1-1/2, 2, 2-1/2, 3 and 4 inch in the same aluminum clamp-on design, all UL and CSA Listed, so a maintenance shop can stock the sizes it actually sees and treat them as one line item. Because every size handles rigid, IMC and EMT, you do not need a separate threaded and non-threaded version of each size.
8) Does the Arlington entrance cap keep rain out of the conduit on its own?
The cap is the weatherproof termination for the top of the run: it turns the conductors downward and seals the opening against rain and debris entering the conduit. It does not seal the conductors themselves. The service drop conductors still need a drip loop below the head so water runs off before it reaches the entry point, and the mast below still needs its own fittings and straps.
9) Do I need anything else besides the entrance cap to finish a conduit mast?
The cap covers the top of the mast only. The rest of the assembly, the conduit itself, the mast strap or roof flashing, the couplings and any connectors at the meter enclosure, are separate items, and this fitting includes no conduit or mounting hardware for the mast. What it does save you is thread prep, since the clamp-on body attaches to plain rigid, IMC or EMT.
How fast can I get the Arlington Industries 149 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Arlington Industries 149 come with a warranty?
Absolutely. The Arlington Industries 149 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Arlington Industries 149?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Arlington Industries 149 from ZenSupply?
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