Duct Spacers Base & Intermediate
Snap-together conduit spacers that accommodate multiple alignment options, providing exceptional strength and unmatched resilience.
A conduit duct spacer is a two-piece interlocking support that holds underground conduits in precise horizontal and vertical alignment while a duct bank is trenched, encased, and backfilled. Innovative Plastics offers duct spacers trusted by contractors for decades, featuring a proven two-piece design engineered to support duct arrays in trenching prior to encasement. These durable, versatile spacers remain securely in place under worker weight and during backfill operations.
Available in eighteen sizes accommodating duct diameters from 2 inches (50 mm) to 8 inches (200 mm), with separation distances from 1.50 inches (40 mm) to 3 inches (80 mm).
Manufactured using premium high-impact polymers and advanced production methods, these spacers resist extreme temperature variations and UV exposure, offering exceptional durability. Each lot meets strict consistency standards for precise duct separation. Pre-assembled configurations are available upon request.
Features
- Vertical and horizontal interlocking for fast, secure field assembly
- Constructed of high-impact polymers
- No banding required
- Used in both encased-burial and direct-burial installations
- Pre-assembly available — just call!
Price range: $1.50–$14.00 each — request a quote for volume and distributor pricing.
Specifications
Sizes & part numbers
| Product image | Product Number | Trade Size (in) | Trade Size (mm) | Case Qty |
|---|---|---|---|---|
 | 4020-15 | 2.00 x 1.50 | 50 x 40 | 450 |
 | 4020-20 | 2.00 x 2.00 | 50 x 50 | 325 |
 | 4020-30 | 2.00 x 3.00 | 50 x 80 | 300 |
 | 4030-15 | 3.00 x 1.50 | 80 x 40 | 250 |
 | 4030-20 | 3.00 x 2.00 | 80 x 50 | 225 |
 | 4030-30 | 3.00 x 3.00 | 80 x 80 | 190 |
 | 4040-10 | 4.00 x 1.00 | 100 x 25 | 250 |
 | 4040-15 | 4.00 x 1.50 | 100 x 40 | 180 |
 | 4040-20 | 4.00 x 2.00 | 100 x 50 | 180 |
 | 4040-30 | 4.00 x 3.00 | 100 x 80 | 150 |
 | 4050-15 | 5.00 x 1.50 | 125 x 40 | 140 |
 | 4050-20 | 5.00 x 2.00 | 125 x 50 | 100 |
 | 4050-30 | 5.00 x 3.00 | 125 x 80 | 90 |
 | 4060-15 | 6.00 x 1.50 | 150 x 40 | 100 |
 | 4060-20 | 6.00 x 2.00 | 150 x 50 | 100 |
 | 4060-30 | 6.00 x 3.00 | 150 x 80 | 90 |
 | 4080-20 | 8.00 x 2.00 | 200 x 50 | 65 |
 | 4080-30 | 8.00 x 3.00 | 200 x 80 | 60 |
| Product image | Product Number | Trade Size (in) | Trade Size (mm) | Case Qty |
|---|---|---|---|---|
 | 4120-15 | 2.00 x 1.50 | 50 x 40 | 500 |
 | 4120-20 | 2.00 x 2.00 | 50 x 50 | 325 |
 | 4120-30 | 2.00 x 3.00 | 50 x 80 | 275 |
 | 4130-15 | 3.00 x 1.50 | 80 x 40 | 250 |
 | 4130-20 | 3.00 x 2.00 | 80 x 50 | 225 |
 | 4130-30 | 3.00 x 3.00 | 80 x 80 | 160 |
 | 4140-10 | 4.00 x 1.00 | 100 x 25 | 250 |
 | 4140-15 | 4.00 x 1.50 | 100 x 40 | 180 |
 | 4140-20 | 4.00 x 2.00 | 100 x 50 | 160 |
 | 4140-30 | 4.00 x 3.00 | 100 x 80 | 125 |
 | 4150-15 | 5.00 x 1.50 | 125 x 40 | 140 |
 | 4150-20 | 5.00 x 2.00 | 125 x 50 | 100 |
 | 4150-30 | 5.00 x 3.00 | 125 x 80 | 90 |
 | 4160-15 | 6.00 x 1.50 | 150 x 40 | 100 |
 | 4160-20 | 6.00 x 2.00 | 150 x 50 | 100 |
 | 4160-30 | 6.00 x 3.00 | 150 x 80 | 75 |
 | 4180-20 | 8.00 x 2.00 | 200 x 50 | 70 |
 | 4180-30 | 8.00 x 3.00 | 200 x 80 | 45 |
Materials & standards
Material
High-impact polymer
Country of origin
Manufactured in Texas, USA.
Compliance
Manufactured to industry standards. Certification details available on request.
Product photos
Every size, pictured
-
4020-15 -
4020-20 -
4020-30 -
4030-15 -
4030-20 -
4030-30 -
4040-10 -
4040-15 -
4040-20 -
4040-30 -
4050-15 -
4050-20 -
4050-30 -
4060-15 -
4060-20 -
4060-30 -
4080-20 -
4080-30 -
4120-15 -
4120-20 -
4120-30 -
4130-15 -
4130-20 -
4130-30 -
4140-10 -
4140-15 -
4140-20 -
4140-30 -
4150-15 -
4150-20 -
4150-30 -
4160-15 -
4160-20 -
4160-30 -
4180-20 -
4180-30
Also referred to as
- Conduit Spacers
- Utility Conduit Spacers
- Conduit Chairs
- Utility Duct Spacers
- Duct Bank Spacers
- Base Spacers
- Intermediate Spacers
- Trench Spacers
FAQ
Frequently asked questions
- What is a duct spacer used for?
- Conduit duct spacers position and support duct arrays in a trench before encasement or backfill, holding consistent horizontal and vertical separation between conduits.
- What duct sizes and separations do base and intermediate spacers cover?
- Eighteen sizes accommodate duct diameters from 2" (50 mm) to 8" (200 mm) with separation distances from 1.5" (40 mm) to 3" (80 mm).
- How do base and intermediate spacers differ?
- Base spacers sit on the trench floor as the bottom course; intermediate spacers stack and interlock above them to build additional layers of the duct bank.
- Do the spacers need banding?
- No. The two-piece design interlocks vertically and horizontally for fast, secure field assembly with no banding required, and stays in place under worker weight and during backfill.
- Can they be pre-assembled?
- Yes — pre-assembled configurations are available on request.
