Centaur 4‑Square Nail‑On PVC B...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$340.81
Centaur 4‑Square Nail‑On PVC Box – 18 cu in & 32 cu in (per 50)

Centaur 4‑Square Nail‑On PVC Box – 18 cu in & 32 cu in (per 50)

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Model: P4SB-NM-NB

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

$340.81
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These Centaur 4‑Square Nail‑On PVC Boxes offer durable and versatile solutions for residential and commercial electrical installations. Made from gray PVC and featuring pre-installed nails, they provide fast mounting directly to studs or framing. Suitable for both new construction and remodels, these boxes accommodate one or two devices with knockouts and clamps for easy cable entry. The two cubic capacities—18 cu in (P4SB‑NM‑NB) and 32 cu in (P4SDB‑NM‑N)—cover a wide range of wiring needs. Both boxes are ETL-listed with a 2‑hour fire rating and compliant with UL standards, ensuring safety and code compliance for indoor wiring applications. 

Key Features:

  • PVC construction in gray

  • Pre-installed nails & cable clamps

  • ½″ knockouts for cable entry

  • ETL-listed, 2‑hour fire rated

  • Ideal for nail-on installations

SKU Length / Diameter Width Depth (Height)
P4SB‑NM‑NB 4″ (102 mm) 5.25″ (133 mm) 1.5″ (38 mm)
P4SDB‑NM‑N 4″ (102 mm) 4″ (102 mm) 2.625″ (67 mm)

Manufacturer Resources

P4SB-NM-NB
P4SDB-NM-N

Product Specs

Application:
Indoor residential/commercial new & remodel installations
Cubic Capacity:
18 cu in, 32 cu in
Knockouts:
1/2 Inch
Package Quantity:
50 per Box
Certifications:
ETL certification
Mounting Feature:
Pre-installed nails
Product Type:
4‑Square Nail‑On PVC Box
Product Group:
Electrical Boxes
Product Subgroup:
Junction Boxes
Product Material:
Gray PVC
Product Weight:
0.38 lb (18 cu in), 0.32 lb (32 cu in)
Product Width:
4 inches
Department:
Electrical
Product Depth:
1.5 inches

Centaur P4SB-NM-NB – Frequently Asked Questions

1) What's the difference between the 18 cu in and 32 cu in Centaur 4-square nail-on PVC boxes?
Capacity and depth. The 18 cu in box (P4SB-NM-NB) is 1.5 inches deep and measures 4 x 5.25 x 1.5 inches. The 32 cu in box (P4SDB-NM-N) is deeper at 2.625 inches, measuring 4 x 4 x 2.625 inches. Pick the 18 cu in for a single device with a modest conductor count; go to the 32 cu in when you are stacking two devices or bringing multiple cables into the same box and need the fill volume. Both are gray PVC with pre-installed nails.
2) Will a 4-square nail-on PVC box work in a remodel, or is it new construction only?
Centaur lists these 4-square PVC boxes for indoor residential and commercial new construction and remodel work. The catch is the mounting: the nails are pre-installed and drive into exposed studs or framing, so in a remodel you need the framing open. For cutting into finished drywall with no stud access, a nail-on box is the wrong choice and you want an old-work box with wing clamps instead.
3) Can I run NM cable into the Centaur PVC nail-on box without adding connectors?
Yes. These boxes come with cable clamps already in the box and 1/2 inch knockouts for entry, so NM cable lands without separate connectors. Size your knockout count to the number of cables you are bringing in, and remember each clamp and cable eats into usable fill, which is where the 32 cu in version earns its depth.
4) Are these Centaur PVC electrical boxes fire rated?
Both the 18 cu in and 32 cu in Centaur 4-square PVC boxes are ETL listed with a 2-hour fire rating and built to UL standards for indoor wiring. That ETL listing is the line item a facility or institutional inspector looks for on a code review.
5) Will a 4-square PVC box hold two devices, or only one?
The Centaur 4-square nail-on PVC boxes are rated for one or two devices. If you are putting two devices in, use the 32 cu in version (P4SDB-NM-N) at 2.625 inches deep, since two devices plus the incoming conductors and clamps will crowd the 1.5 inch deep 18 cu in box.
6) How many Centaur 4-square nail-on PVC boxes come in a box, and can I buy just one?
These ship 50 per box. It is a contractor-pack item, so a full rough-in order is counted in cartons of 50 rather than singles. At 0.38 lb each for the 18 cu in and 0.32 lb for the 32 cu in, a 50-count carton stays easy to carry up a ladder.
7) Can I use a PVC nail-on box outdoors or in a damp location?
No. Centaur specifies these 4-square PVC boxes for indoor residential and commercial wiring only. For exterior walls, wet or damp locations you need a weatherproof box and gasketed cover rated for that use, not this nail-on interior box.
8) Do these PVC boxes need a separate ground screw like a metal box?
The Centaur 4-square boxes are gray PVC, a non-conductive enclosure, so there is no metal shell to bond. Your equipment grounding conductors are joined inside the box and carried to the device ground terminal. That also means no corrosion to worry about in the box itself.
How fast can I get the Centaur P4SB-NM-NB 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 Centaur P4SB-NM-NB come with a warranty?
Absolutely. The Centaur P4SB-NM-NB 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 Centaur P4SB-NM-NB?
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 Centaur P4SB-NM-NB from ZenSupply?
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