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The Polylok 500mm septic tank cover is a durable, professional-grade access solution for septic tanks, 7-hole percolation area distribution boxes, and wastewater inspection points. Designed for reliability, safety, and ease of installation, this septic tank cover is widely used by installers, contractors, and DIY customers across Ireland, the UK, and Europe.
Manufactured from high-density polyethylene (HDPE), the cover provides excellent resistance to corrosion, frost, moisture, and UV exposure, making it ideal for long-term outdoor use in Irish and UK climates. Unlike traditional concrete covers, it is lightweight and easy to handle while still offering dependable strength for pedestrian foot traffic.
With a 500mm (20”) diameter, this septic tank cover seamlessly fits Polylok 7-hole percolation area distribution boxes, as well as Polylok risers and adapter rings. This ensures a clean, professional installation and makes it particularly suitable for raising access points to finished ground level during new installations or septic system refurbishments.
A factory-installed gasket creates a secure, airtight and watertight seal, helping to prevent odours, surface water ingress, and debris contamination. The textured, slip-resistant surface improves safety underfoot in wet or muddy conditions, while the green finish blends naturally into landscaped gardens, lawns, and outdoor spaces.
For enhanced safety, optional Polylok safety screens can be installed within compatible risers, offering added peace of mind by preventing accidental access while still allowing airflow and inspection. This makes the system especially suitable for residential environments where child and pet safety is a priority.
To complete your installation, compatible Polylok riser kits, adapter rings, and safety screens are available, forming a modular access system trusted by wastewater professionals throughout Europe.
Polylok 500mm Riser Kits – raise access points to finished ground level
Polylok Safety Screens – optional internal protection within risers
| Specification | Details |
|---|---|
| Product Type | Septic Tank / Distribution Box Cover |
| Diameter | 500mm (20”) |
| Material | High-Density Polyethylene (HDPE) |
| Load Rating | Pedestrian rated only – up to 425kg |
| Seal | Integrated gasket |
| Surface | Textured, slip-resistant |
| Colour | Green |
| Compatibility | Polylok risers, adapters & 7-hole distribution boxes |
| Applications | Septic tanks, percolation distribution boxes |
