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Thomas & Betts NPL1X4-G OCAL PVC-Coated Conduit Nipple, 1" x 4", Corrosion-Resistant
The Thomas & Betts NPL1X4-G is a PVC-coated conduit nipple from the OCAL series, engineered to connect conduit sections at enclosures, boxes, and equipment terminations in corrosive, wet, or chemically aggressive installation environments. This nipple carries a 1" trade size and a 4" overall length, with a PVC coating applied over the fitting body to help resist corrosion where standard uncoated conduit fittings would otherwise be prone to rust and deterioration. As part of the Thomas & Betts OCAL line of PVC-coated conduit fittings, the NPL1X4-G is designed to integrate into industrial and commercial electrical raceway systems, providing a short, reliable connection point between conduit runs, boxes, or other conduit body fittings. The OCAL series is manufactured under the Thomas & Betts brand and is identified in the manufacturer catalog by the model designation NPL1X4-G.
Key Features
- Trade Size: 1" trade size conduit nipple with a 4" overall length, sized for standard conduit-to-conduit and conduit-to-enclosure connections.
- PVC-Coated Construction: A PVC coating is applied over the fitting body, adding a corrosion-resistant layer for installations exposed to moisture, chemicals, or other corrosive conditions.
- Conduit Nipple Design: A short nipple fitting used to join conduit runs at enclosures, boxes, panels, and other conduit entry points where a compact connection is required.
- OCAL Series: Manufactured as part of the Thomas & Betts OCAL line of PVC-coated conduit fittings, built for corrosion protection in demanding raceway applications.
- Model NPL1X4-G: The manufacturer part number NPL1X4-G identifies this fitting within the OCAL catalog for accurate specification, cross-reference, and ordering.
- Conduit Compatibility: Functions as a connecting nipple within conduit raceway systems, linking conduit sections and fittings at a defined 1" x 4" trade size and length.
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Corrosive and Chemical-Resistant Conduit Installations
- Wastewater Treatment and Industrial Processing Facilities
- Outdoor and Wet-Location Conduit Runs
- Conduit Connections at Enclosures and Junction Boxes
- Commercial and Industrial Electrical Raceway Systems
- New Construction and Retrofit Conduit Systems
Why Thomas & Betts?
Thomas & Betts is a recognized manufacturer of electrical conduit and fitting products, and the OCAL series is purpose-built for PVC-coated corrosion protection in demanding environments such as wastewater treatment, chemical processing, and other corrosive industrial settings. The NPL1X4-G conduit nipple delivers a dependable conduit-to-conduit connection backed by that PVC-coated construction, helping installers maintain a reliable, corrosion-resistant raceway system. Choosing OCAL PVC-coated fittings from Thomas & Betts supports long-term performance and reduced maintenance in electrical installations exposed to harsh conditions.
Manufacturer Resources
Product Specs
- list_batch:
- TB-20260918
- Product Type:
- Conduit Nipple
- Product Finish:
- PVC-Coated
- Series:
- OCAL
- Department:
- Electrical
- Product Subgroup:
- PVC Conduit & Fittings
- Product Size:
- 1" x 4"
- Product Group:
- Conduit & Raceway
- Product Color:
- Gray
- Product Material:
- Steel
- Application:
- To Connect Two Fittings
Ocal NPL1X4-G – Frequently Asked Questions
1) Is the Ocal PVC-coated nipple steel underneath the coating, or all plastic?
Steel body with a PVC coating applied over it. You get the mechanical strength and threaded integrity of a steel nipple plus a gray PVC jacket for corrosion protection, which is why it is specified in wastewater, chemical processing, and wet outdoor runs rather than a bare galvanized nipple.
2) What is the difference between the Ocal NPL1X4-G conduit nipple and a SEPCO 90Z chase nipple?
They do different jobs despite both being called nipples. The Ocal NPL1X4-G is a 1 inch by 4 inch steel conduit nipple with a PVC-coated finish, used to connect two fittings in a raceway run. The SEPCO 90Z is a zinc die-cast hex head chase nipple with a non-insulated throat, which threads into a box or enclosure knockout to terminate a run rather than bridging two fittings. If you need a short length of threaded conduit between two bodies, the NPL1X4-G is the part; if you need to land a conduit entry at a knockout, the chase nipple style is the one to look at.
3) Can a SEPCO 90Z be used in place of an Ocal PVC-coated nipple in a wastewater or chemical plant?
The two are built for different exposure. The Ocal NPL1X4-G carries a PVC coating over a steel body specifically for corrosive, wet, and chemically aggressive locations, and it is part of a coated-fitting system where the coating continues across the raceway. The SEPCO 90Z is zinc die-cast with no coating called out, so it does not carry that coated-system protection. For a run specified as PVC-coated throughout, stay with the coated nipple so the corrosion barrier is unbroken at the joint.
4) Will a PVC-coated nipple keep the corrosion protection continuous through a conduit run?
That is the point of it. Mixing a bare steel nipple into a PVC-coated raceway leaves an unprotected link where rust starts first, usually at the threads. The NPL1X4-G carries the same PVC coating over a steel body as the rest of the Ocal line, so the connection at an enclosure, box, or conduit body stays coated. Follow your normal practice of sealing the thread area at each joint.
5) I just need a cheap nipple to land a conduit into a dry indoor junction box - do I need the Ocal NPL1X4-G?
For a dry indoor knockout termination, a plain chase nipple such as the SEPCO 90Z zinc die-cast hex head type covers that use, and its hex head lets you drive it into the knockout. The Ocal NPL1X4-G is a 1 inch by 4 inch PVC-coated steel nipple intended to connect two fittings in runs exposed to moisture or chemicals, so its coating is doing work you would not be using indoors in a dry location.
6) Is NPL1X4-G the right part number to re-order for a 1 inch Ocal nipple?
Yes. NPL1X4-G is the manufacturer part number for the 1 inch by 4 inch gray PVC-coated nipple in the Ocal line under the Thomas and Betts brand. It is a single configuration, so there are no finish or length options to specify beyond the part number itself.
7) Where is a 4 inch nipple used rather than just running conduit between two boxes?
Short spans. A 4 inch nipple handles the case where two fittings, boxes, or panels sit close together and cutting and threading a stub of conduit is impractical. Common spots are box-to-box connections on a panel wall, conduit body to enclosure transitions, and retrofit tie-ins where you need a compact coupled joint. For corrosive or wet locations the PVC-coated version keeps that short link protected.
8) Does the SEPCO 90Z chase nipple have an insulated throat like some bushings, and does the Ocal nipple?
The SEPCO 90Z is specified with a non-insulated throat. The Ocal NPL1X4-G is a threaded conduit nipple that joins two fittings rather than a throated box entry, so throat insulation is not part of how it is described; where conductors need thermoplastic protection at the entry, that is handled by a separate insulating bushing on the connection.
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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 Ocal NPL1X4-G come with a warranty?
Absolutely. The Ocal NPL1X4-G is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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