Distribution Box Inlet Dimensions and Specifications Table
Distribution boxes vary by material, inlet size, number of ways, and installation type, with standard inlets typically designed for 4” pipes and adjustable risers for inspection access.
Key Specifications
| Feature | Regular Box | Hillside Box | Polylok Box | American Box |
|---|---|---|---|---|
| Material | HDPE Single Wall | HDPE Single Wall | Polypropylene | HDPE |
| Inlet Type | Internal press fit, 4” smooth wall | External press fit, 4” smooth wall | 2”, 3”, 4” (110mm) holes | Twist-lock 4” pipe seals |
| Outlet Type | Internal snap into 4” pipe | Internal snap into 4” pipe | Internal snap into 4” pipe | Twist-lock 4” pipe seals |
| Capacity | 7.25 gallons to overflow | 8 gallons to overflow | Varies by number of holes (4–10) | Adjustable with risers |
| Riser Options | Optional risers for inspection | Optional risers for inspection | Accepts Polylok risers for extra height | 14” riser for at-grade access, gas/watertight |
| Seals | Standard press-fit | Standard press-fit | Supplied with seals | Twist-lock, adaptable for increased head |
| Lockable Cover | Not standard | Not standard | Lockable pedestrian-rated cover | Optional stainless steel screw package |
| Installation Notes | Smooth wall pipe connection | Smooth wall pipe connection | Quick installation, robust, easy access | Anti-flotation adapter flange, sealing compound recommended |
Additional Details
- Material and Durability: HDPE and polypropylene boxes are non-corrosive, lightweight, and strong for long-term use .
- Inlet/Outlet Configuration: Standard inlets are designed for 4” pipes, with internal or external press-fit connections depending on the box type . Polylok boxes offer multiple hole sizes (2”, 3”, 4”) for flexibility .
- Risers and Access: Riser options allow inspection and leveling. American boxes provide a 14” riser with anti-flotation flange, while Polylok boxes accept risers for added height .
- Sealing and Installation: Twist-lock seals or press-fit connections ensure watertight or gas-tight installation. For increased head installations, sealing compounds can be applied to the seal surface .
- Capacity: Regular HDPE boxes hold approximately 7.25 gallons, hillside boxes 8 gallons, while multi-hole Polylok boxes vary depending on the number of outlets .
- Locking Options: Some boxes include lockable covers to prevent tampering or accidents, particularly in pedestrian areas . These specifications provide a comprehensive overview for selecting and installing distribution boxes in residential or commercial drainage and septic systems, ensuring compatibility with standard 4” piping and local code requirements.
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