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Cantex 51337 PVC Conduit-to-Box Transition Adapter
The Cantex 51337 PVC Box Adapter is a molded PVC fitting designed to provide a clean, code-compliant transition between rigid PVC conduit runs and standard electrical boxes. This box adapter series is available in trade sizes ranging from 1/4" to 3/4", giving installers a matched fitting for nonmetallic conduit systems where a secure, corrosion-resistant connection point into a junction box, device box, or enclosure is required. Its PVC construction makes it well suited for underground, wet, and corrosive environments where metallic fittings would be prone to rust and degradation over time.
Key Features
- Trade Size Range: Available from 1/4" to 3/4" to match matching PVC conduit runs and box knockouts.
- Durable Construction: Molded PVC body resists corrosion, moisture, and chemical exposure for long-term reliability.
- Box Adapter Design: Provides a dedicated transition fitting between PVC conduit and electrical boxes, simplifying rough-in and box termination.
- Lightweight Fitting: PVC material keeps the fitting lightweight compared to metallic alternatives, easing handling and installation.
- Non-Conductive Material: PVC construction adds a layer of electrical insulation at the box connection point.
Technical Specifications
- Trade Size Range: 1/4" - 3/4"
- Material: PVC
- Product Type: Box Adapter
Typical Applications
- PVC Conduit and Raceway Systems
- Junction Box and Device Box Terminations
- Underground and Direct Burial Conduit Runs
- Commercial and Residential Electrical Rough-In
- Corrosive and Wet Location Installations
Why Cantex?
Cantex PVC fittings are engineered from durable, corrosion-resistant PVC to deliver dependable performance in demanding electrical conduit systems. The 51337 Box Adapter series reflects Cantex's focus on practical, code-oriented fitting designs that simplify conduit-to-box transitions for electrical professionals across a full range of trade sizes.
Manufacturer Resources
Product Specs
- list_batch:
- CAN-20260924
- Product Type:
- Specialty PVC Fitting
- Department:
- Electrical
- Product Subgroup:
- PVC Conduit & Fittings
- Product Material:
- PVC
- Product Group:
- Conduit & Raceway
Cantex 5133716 – Frequently Asked Questions
1) What trade sizes does the Cantex 51337 PVC box adapter come in?
Three trade sizes: 1/4 inch, 1/2 inch and 3/4 inch. The part numbers run 5133718 for 1/4 inch, 5133721 for 1/2 inch and 5133716 for 3/4 inch, so order by the size of the PVC conduit run and the box knockout it has to land in.
2) Can a PVC box adapter be used on underground or direct burial conduit runs?
Yes. The 51337 is molded PVC, so it resists corrosion, moisture and chemical exposure, and Cantex lists underground and direct burial conduit runs along with wet and corrosive locations among its applications. That is the main reason to choose it over a metallic fitting, which rusts at the box connection over time.
3) What does a conduit-to-box adapter actually do that a regular coupling won't?
A coupling joins two lengths of conduit. The 51337 box adapter is the termination piece: it takes the rigid PVC conduit and lands it into a knockout on a junction box, device box or enclosure, giving you a finished connection point instead of a bare conduit end. If you are joining pipe to pipe, you want a coupling; if you are entering a box, this is the fitting.
4) Will a 3/4 inch PVC box adapter fit a standard 3/4 inch box knockout?
Yes, the 3/4 inch version (part 5133716) is sized to trade 3/4, which matches both 3/4 inch rigid PVC conduit and a standard 3/4 inch knockout. Trade sizing is the same convention on both sides, so match the adapter size to the conduit you are running.
5) I need to adapt a 4 inch square box down to a 3 inch round opening - will a Cantex 51337 do it?
No. The Cantex 51337 is a conduit termination fitting, molded in PVC, that brings a rigid PVC conduit run in trade sizes 1/4 inch through 3/4 inch into a box or enclosure. Reducing a 4 inch square box opening to a 3 inch round pattern is what the Mulberry 11214 CV52R3 square-to-round box adapter is built for, and it is supplied in packs of 100 for repeat rough-in work. Use the Cantex fitting for the conduit entry and the Mulberry adapter for the box face.
6) Is a PVC box adapter non-conductive at the box connection?
It is. Because the body is PVC rather than metal, the fitting itself does not carry current and adds insulation where the raceway enters the box. Note that PVC gives you no equipment grounding path, so your grounding conductor has to be pulled through the run the same as with any nonmetallic raceway system.
7) Do I need a separate locknut or bushing with the Cantex 51337 box adapter?
The 51337 is a one-piece molded PVC adapter supplied as the transition fitting only. Anything else your termination calls for, solvent cement for the conduit joint and whatever retention the box knockout requires, is ordered separately.
How fast can I get the Cantex 5133716 delivered?
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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 Cantex 5133716 come with a warranty?
Absolutely. The Cantex 5133716 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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