IPEX SMB-H-15 PVC Round Slab B...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$38.27
IPEX SMB-H-15 PVC Round Slab Box With Molded Connector, (4) 3/4-Inch Hub, 3-5/8-Inch Kwikon®

IPEX SMB-H-15 PVC Round Slab Box With Molded Connector, (4) 3/4-Inch Hub, 3-5/8-Inch Kwikon®

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Model: SMB-H-15

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

$38.27
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IPEX SMB-H-15 PVC Round Slab Box With Molded Connector, (4) 3/4-Inch Hub, 3-5/8-Inch Kwikon®

The IPEX SMB-H-15 is a PVC round slab box engineered with a molded connector and (4) 3/4-Inch hubs, sized for a 3-5/8-Inch Kwikon® fit. Built from durable PVC, this round slab box is designed for embedment in concrete slab construction where a compact, corrosion-resistant junction point is required for conduit runs. The molded connector design integrates directly into the box body, streamlining installation and reducing the number of separate fitting components needed on the job. With four 3/4-Inch hubs arranged around the box, it accommodates multiple conduit entries from a single, low-profile enclosure.

Key Features

  • Trade Size: (4) 3/4-Inch hub openings for connecting 3/4-Inch conduit runs into a single junction point.
  • Kwikon® Fit: Sized to 3-5/8-Inch Kwikon® dimension for compatibility with standard slab box installation hardware.
  • Durable Construction: Molded PVC body resists corrosion, moisture, and the chemical exposure common in concrete slab environments.
  • Molded Connector Design: Integrated molded connector simplifies conduit termination and reduces installation time versus separate hub fittings.
  • Round Slab Box Profile: Compact round form factor suited for embedment in concrete slabs where space and clearance are limited.
  • Multi-Hub Configuration: Four hubs allow for multiple conduit entries and branch connections from one enclosure.

Technical Specifications

  • Product Type: Round Slab Box
  • Material: PVC
  • Hub Size: 3/4-Inch
  • Hub Count: 4
  • Kwikon® Size: 3-5/8-Inch
  • Connector Style: Molded

Typical Applications

  • Concrete Slab Conduit Junction Points
  • Underground and In-Slab Electrical Rough-In
  • Commercial and Residential Slab Construction
  • PVC Conduit Systems Requiring Multiple Hub Entries
  • New Construction Electrical Rough-In

Why IPEX?

IPEX builds its PVC slab boxes with molded connector construction that holds up to the demands of concrete embedment, giving installers a reliable junction point for conduit systems that must perform for the life of the structure. The four-hub, molded-connector design of the SMB-H-15 reflects a practical approach to reducing fitting count and simplifying rough-in work. Choose IPEX PVC electrical products for corrosion-resistant, code-supportive components built for professional slab installations.

Manufacturer Resources

Product Specs

list_batch:
IPE-20260924
Product Type:
Outlet Box
Department:
Electrical
Product Subgroup:
Electrical Boxes
Product Material:
PVC
Product Weight:
0.364 kg
Product Group:
Boxes & Enclosures

IPEX SMB-H-15 – Frequently Asked Questions

1) What size conduit does the IPEX SMB-H-15 slab box accept, and how many entries does it have?
The SMB-H-15 round slab box has four 3/4 inch hubs, so it takes four separate 3/4 inch PVC conduit runs into one junction point. The hubs use a molded connector built into the box body, which means you terminate the conduit directly at the box instead of adding a separate connector fitting on each entry.
2) Can this PVC slab box be poured into a concrete slab?
Yes, embedment in concrete slab construction is what it is built for. The molded PVC body resists corrosion, moisture, and the chemical exposure found in slab environments, and the round, low-profile form keeps it workable where slab depth and clearance are tight. Typical use is in-slab and underground electrical rough-in on new commercial and residential construction.
3) Is the IPEX SMB-H-15 the right part for a liquidtight flexible conduit run?
No. The SMB-H-15 is a round PVC slab box with molded 3/4 inch hubs for rigid PVC conduit embedded in concrete, not a liquidtight fitting. For liquidtight flex you want a dedicated connector such as the Ocal ST34-G PVC-coated steel straight liquidtight connector in 3/4 inch, or the Hubbell Wiring PS0509N SwivelLok multi-position liquidtight nylon connector in 1/2 inch.
4) Can an Ocal ST34-G 3/4-inch liquidtight connector be used in place of the IPEX SMB-H-15?
No. The IPEX SMB-H-15 is a PVC round slab box with an integrated molded connector and four 3/4-inch hubs, meant to be embedded in a concrete slab as a junction point for multiple conduit entries. The Ocal ST34-G is a PVC-coated steel non-grounding liquidtight straight connector in 3/4-inch trade size - a single termination fitting that lands one run of liquidtight flexible conduit into an enclosure. The two share a 3/4-inch trade size and nothing else: the Ocal part provides no enclosure volume and no slab box body, so it cannot serve as the junction point the SMB-H-15 creates.
5) What does the 3-5/8 inch Kwikon size on the IPEX SMB-H-15 refer to?
3-5/8 inches is the box's Kwikon dimension, which is what makes it line up with standard slab box installation hardware in the Kwikon system. If your rough-in is specified around 3-5/8 inch Kwikon boxes, this one matches that sizing.
6) Do I need separate conduit connectors with the SMB-H-15, or is it an all-in-one fitting?
The connector is molded into the box, so you do not add individual hub connectors for the four 3/4 inch entries. That drops the fitting count on a slab rough-in and cuts a step per conduit run. You still supply the conduit, any adapters for sizes other than 3/4 inch, and whatever cover or support the pour requires.
7) What is the difference between a PVC slab box like the IPEX SMB-H-15 and a PVC-coated connector like the Ocal ST145-G?
Material strategy and function both differ. The IPEX SMB-H-15 is molded entirely from PVC, so corrosion resistance is inherent to the body, and it functions as a round slab box that gathers up to four 3/4-inch conduit entries into one low-profile enclosure cast into concrete. The Ocal ST145-G is a PVC-coated liquidtight flexible conduit connector - a steel fitting with a PVC coating applied over it, used to terminate liquidtight flex. If the drawing calls for an in-slab junction point, the slab box is the part; if it calls for a corrosion-protected liquidtight termination at a motor or device, that is the connector's role.
8) I need a flexible, angle-adjustable conduit termination rather than a slab junction box - what should I look at instead of the IPEX SMB-H-15?
The SMB-H-15 is a fixed, rigid PVC slab box: four 3/4-inch hubs in set positions, designed to be poured into a concrete slab, so it offers no angular adjustment once placed. For a termination that can be aimed, the Hubbell Wiring PS0509N is a SwivelLok multi-position liquidtight nylon connector in 1/2-inch trade size, which lets the conduit approach the enclosure at varying angles. Note the trade size change from 3/4-inch to 1/2-inch, and that the Hubbell part terminates liquidtight flex at an enclosure rather than forming the enclosure itself.
9) My slab rough-in only needs a single conduit entry - do I still need the four-hub IPEX SMB-H-15?
The SMB-H-15 earns its place when multiple conduit runs or branch connections meet at one point, since its four 3/4-inch hubs collect several entries into a single low-profile enclosure and the molded connector design cuts the number of separate fittings needed. For a single 3/4-inch run that simply terminates into an existing enclosure, a straight connector such as the Ocal ST34-G, a PVC-coated steel non-grounding liquidtight straight connector in 3/4-inch, handles one conduit at a time. Keep in mind the Ocal fitting is for liquidtight flexible conduit and provides no box volume.
10) Will a PVC slab box hold up better than a steel fitting in a wet or corrosive slab?
The SMB-H-15's body is molded PVC, which does not rust and takes moisture and the chemical exposure of a concrete pour without coating or galvanizing. Where a steel path is required instead, PVC-coated steel is the usual answer, for example the Ocal ST145-G or ST34-G PVC-coated liquidtight connectors, which put a PVC jacket over a steel fitting.
11) What is the exact part number to order this IPEX four-hub slab box?
Order it as IPEX SMB-H-15. That single model number covers the round PVC slab box with the molded connector, four 3/4 inch hubs, and the 3-5/8 inch Kwikon size. There are no finish or size variants to specify.
12) Will a nylon liquidtight connector such as the Hubbell PS0509N hold up in concrete the way the IPEX SMB-H-15 does?
They are built for different exposures. The IPEX SMB-H-15 is molded PVC specifically for embedment in concrete slab construction, where it resists corrosion, moisture, and the chemical exposure common to that environment, and it is sized to a 3-5/8-inch Kwikon fit for slab box installation hardware. The Hubbell PS0509N is a SwivelLok nylon liquidtight connector in 1/2-inch trade size, intended as a cord or flex termination at an enclosure rather than as a cast-in component. For in-slab rough-in work, specify the slab box; reserve the nylon connector for accessible terminations.
How fast can I get the IPEX SMB-H-15 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 IPEX SMB-H-15 come with a warranty?
Absolutely. The IPEX SMB-H-15 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 IPEX SMB-H-15?
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
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