VicRoads Concrete Single Flushout Riser — SD 1631–compliant maintenance access for subsoil/pavement drains.
The VicRoads Concrete Single Flushout Riser is a surface access point for cleaning and inspection of subsurface/pavement drains that complies with VicRoads / DTP Standard Drawing SD 1631. It enables jetting and debris removal while protecting the pavement structure.
Two formats are available: a compact 450mm x 450mm unit and a larger 950mm x 850mm “with apron” unit for increased surface bearing and access. Units are manufactured from high-strength precast concrete for durability and low maintenance in road and civil environments.
Need two access points? See the Double Flushout Riser.
| Standard | VicRoads / DTP SD 1631 — Pavement Drain: Terminals (single flushout riser detail). |
| Material | High-strength precast concrete. |
| Interface | Maintenance access to subsurface/pavement drains per SD 1631 and the project design. |
| Associated drawings | SD 1611 (Subsurface Drain — Pits), SD 1641 (Pavement Drain — Alternative Arrangements). |
| Variants | Single Flushout Riser (this page) and Double Flushout Riser; 450mm x 450mm and 950mm x 850mm “with apron”. |
Note: Confirm project-specific detailing (levels, bedding, filter material, apron dimensions and placement) to the engineer’s design and SD 1631.
Download SD 1631 (PDF) | Request a quote
Related: Double Flushout Riser
| Product Code | Product Description | Top Size | Bottom Size | Body Weight | Lid Weight | SD REF |
|---|---|---|---|---|---|---|
| VRFLUSHSING450 | Single Flushout Riser — body & lid | 450mm x 450mm | 470mm x 470mm | 40kg | 10kg | SD 1631 |
| VRFLUSHSING950 | Single Flushout Riser — with apron, body & lid | 950mm x 850mm | 975mm x 875mm | 260kg | 10kg | SD 1631 |
Use: complies with VicRoads / DTP SD 1631 (single flushout riser detail).
Provides a surface access point for jetting and inspection of subsurface/pavement drains.
Single provides one access point. Double provides two access points for systems with dual lines or higher access needs.
450mm x 450mm, and 950mm x 850mm “with apron”.
As detailed on SD 1631—commonly under the shoulder/back of kerb with a concrete apron per the drawing.
It provides access to the subsoil/pavement drain run per SD 1631 and the project design.
Yes—bodies and lids can be supplied together or separately as required.
Approx. 40kg body + 10kg lid (450mm unit); approx. 260kg body + 10kg lid (950mm x 850mm with apron). Confirm at order.
The 950mm x 850mm option is the “with apron” format. Construct aprons/bedding as detailed on SD 1631 and project drawings.
SD 1611 (subsurface pits) and SD 1641 (alternative arrangements).
Standard items are often available quickly; larger/apron units may require extra lead time. Delivery by truck to be forklift unloaded. Crane available on request.
