Enduramaxx Slimline Potable Water Tanks
Selected tank: 500 L
- Model / SKU
- 171305-Potable
- Nominal capacity
- 500 litres
- Tank type
- Potable-water configuration
- Dimensions
- L 900 × W 615 × H 1200 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 455 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Selected tank: 1,000 L
- Model / SKU
- 171312-Potable
- Nominal capacity
- 1,000 litres
- Tank type
- Potable-water configuration
- Dimensions
- L 1350 × W 760 × H 1300 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 2 × 455 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Need help choosing fittings for this tank? Contact us for advice on compatible valves and adaptors.
These Enduramaxx slimline potable-water tanks provide drinking-water storage where floor space is restricted. Their narrow rectangular shape suits plant rooms, buildings and other correctly prepared locations where a conventional round tank may not fit.
Tank dimensions by model
Nominal dimensions in millimetres. L = length, W = width, H = height, Ø = diameter. Updated rows use Enduramaxx drawings and clarification supplied on 2 November 2026; other rows retain existing manufacturer specifications. Read each row’s measurement and configuration notes. Allow installation and maintenance clearance, including the manufacturer’s ±3% tolerance where stated. Nominal lid/cover size is not the clear access opening.
| Tank / model | Dimensions (mm) | Standard outlet | Nominal lid / cover (mm) |
|---|---|---|---|
|
500 L 171305-Potable |
L 900 × W 618 × H 1281 Enduramaxx confirms that potable and non-potable slimlines have the same heights. Overall dimensions from the supplied 500 L slimline drawing. |
1½-inch male BSP | 455 |
|
1,000 L 171312-Potable |
L 1350 × W 760 × H 1346 Overall height including lid. Enduramaxx confirms the potable slimline has the same height as the equivalent non-potable version. |
1½-inch male BSP | 455 2 lids |
Manufacturer dimensioned drawings
Download Enduramaxx dimensioned drawings (PDF) for 500 L and 1,000 L rectangular slimlines, 400 L and 1,000 L baffled upright tanks, and 500 L and 1,000 L CAT 5 tanks. The rectangular slimline drawings are for the base tank mouldings; Enduramaxx confirms potable and non-potable slimline heights are the same. Choose the correct page and water classification. These are manufacturer drawings supplied on 2 November 2026. Match the model and inlet/turret configuration before using a drawing for access or base planning.
Available sizes
- 500 litres: overall dimensions require confirmation before ordering
- 1,000 litres: overall dimensions require confirmation before ordering; supplied with two lids
The tanks are one-piece, rotationally moulded from WRAS-approved medium-density polyethylene, with a Bye-law 30 kit for the potable-water configuration (Bye-law 60 in Scotland).
Confirm the selected tank's current certification, outlet and lid arrangement, usable capacity, installation access and offloading requirements before ordering. Provide a flat, continuous load-bearing base and design the inlet, overflow, ventilation, insulation and backflow protection to meet the applicable water regulations. Potable suitability does not by itself provide Fluid Category 5 protection.
Manufacturer installation guide
See the supporting gallery images for a readable summary of Enduramaxx’s base preparation, pipework support, ventilation and pre-use checks for these above-ground tanks. Lift tanks only when empty. Tank entry requires appropriate precautions against lack of oxygen and hazardous vapours; do not enter without suitable confined-space controls. The complete guide below retains the remaining handling, installation and warranty instructions.
Download Enduramaxx’s vertical and slimline above-ground tank installation guide (PDF). Read the handling, base and fitting instructions before installation.
Tank outlet and blanking cap
The standard tank connector/outlet has a male BSP thread. See the specifications for the outlet size of your selected tank.
A red protective cap is supplied on the outlet. If you will not be using this outlet, a matching female BSP Hansen cap must be purchased separately to blank it off. Choose the same nominal BSP size as the tank outlet.
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