Enduramaxx Slim Water Tanks
Selected tank: 400 L · baffled flat
- Model / SKU
- 17170401
- Nominal capacity
- 400 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1200 × W 1050 × H 455 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Selected tank: 400 L · baffled upright
- Model / SKU
- 17160401
- Nominal capacity
- 400 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1050 × W 400 × H 1253 mm (manufacturer-listed; version confirmation required)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
The feature specification lists H1253; the additional-information table lists H1200. Confirm the current overall height.
Selected tank: 500 L · CAT 5
- Model / SKU
- 17150501CAT5
- Nominal capacity
- 500 litres
- Tank type
- CAT 5 Type AB air-gap break tank
- Dimensions
- L 1200 × W 640 × H 1375 mm (manufacturer-listed; version confirmation required)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 455 mm nominal lid diameter; non-vented
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
- Inlet / air gap
- Up to 25 mm, manufacturer-listed; confirm complete inlet and overflow arrangement
The feature specification lists L1200 × W640 × H1375; the additional-information table lists L1200 × W720 × H1600. Confirm the complete tank including turret/weir.
Selected tank: 500 L · baffled horizontal
- Model / SKU
- 17150501
- Nominal capacity
- 500 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1200 × W 500 × H 1155 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Selected tank: 500 L · baffled upright
- Model / SKU
- 17160501
- Nominal capacity
- 500 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1100 × W 500 × H 1250 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Selected tank: 1,000 L · baffled vertical
- Model / SKU
- 17161001
- Nominal capacity
- 1,000 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1250 × W 600 × H 1650 mm (manufacturer-listed; version confirmation required)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
The current product page lists H1650. An earlier linked drawing distinguished body H1650 from overall H1703, and the supplier listed H1705. Confirm the overall height including lid.
Selected tank: 1,000 L · CAT 5
- Model / SKU
- 17131001CAT5
- Nominal capacity
- 1,000 litres
- Tank type
- CAT 5 Type AB air-gap break tank
- Dimensions
- L 1350 × W 760 × H 1600 mm (manufacturer-listed; version confirmation required)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 455 mm nominal lid diameter; non-vented
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
- Inlet / air gap
- Up to 25 mm, manufacturer-listed; confirm complete inlet and overflow arrangement
The current manufacturer page lists L1350 × W760 × H1600. The existing supplier record lists H1845. Confirm the complete supplied tank/weir height.
Selected tank: 1,000 L · baffled flat
- Model / SKU
- 17171001
- Nominal capacity
- 1,000 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1650 × W 1250 × H 655 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Selected tank: 1,000 L · baffled horizontal
- Model / SKU
- 17151001
- Nominal capacity
- 1,000 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1650 × W 600 × H 1305 mm (manufacturer-listed nominal size)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 255 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
Selected tank: 1,000 L · rectangular non-potable
- Model / SKU
- 17131001
- Nominal capacity
- 1,000 litres
- Tank type
- Non-potable / confirm exact application
- Dimensions
- L 1350 × W 760 × H 1300 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.
Need help choosing fittings for this tank? Contact us for advice on compatible valves and adaptors.
Enduramaxx slim water tanks provide useful storage where width or overall height is restricted. The range includes horizontal, vertical, flat and rectangular formats in 400, 500 and 1,000 litre nominal capacities.
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) |
|---|---|---|---|
|
400 L · baffled flat 17170401 |
L 1200 × W 1050 × H 455 |
1½-inch male BSP | 255 |
|
400 L · baffled upright 17160401 |
L 1050 × W 400 × H 1253 Overall height including lid: 1253 mm. Tank-body height: 1200 mm. |
1½-inch male BSP | 255 |
|
500 L · CAT 5 17150501CAT5 |
L 1200 × W 720 × H 1594 Overall dimensions of the illustrated CAT 5 tank including the air-gap turret. Drawing specifies a turret for an inlet up to 2 inches; confirm the required inlet arrangement when ordering. |
1½-inch male BSP | 455 |
|
500 L · baffled horizontal 17150501 |
L 1200 × W 500 × H 1155 |
1½-inch male BSP | 255 |
|
500 L · baffled upright 17160501 |
L 1100 × W 500 × H 1250 |
1½-inch male BSP | 255 |
|
1,000 L · baffled vertical 17161001 |
L 1250 × W 600 × H 1703 Overall height including lid: 1703 mm. Tank-body height: 1650 mm. |
1½-inch male BSP | 255 |
|
1,000 L · CAT 5 17131001CAT5 |
L 1350 × W 760 × H 1795 Overall dimensions of the illustrated CAT 5 tank including the air-gap turret. Drawing specifies a turret for an inlet up to 2 inches; confirm the required inlet arrangement when ordering. |
1½-inch male BSP | 455 |
|
1,000 L · baffled flat 17171001 |
L 1650 × W 1250 × H 655 |
1½-inch male BSP | 255 |
|
1,000 L · baffled horizontal 17151001 |
L 1650 × W 600 × H 1305 |
1½-inch male BSP | 255 |
|
1,000 L · rectangular non-potable 17131001 |
L 1350 × W 760 × H 1346 Overall height including lid from drawing 171310-1000-RECTANGULAR. |
1½-inch male BSP | 455 |
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.
Choose by application and shape
- Baffled slim tanks for the orientation stated in the selected variant
- Rectangular and upright tanks for the application stated in the selected option
- CAT 5 Type AB options with an air-gap weir for qualifying backflow-protection installations
The tanks are rotationally moulded from medium-density polyethylene. Full dimensions, outlets and any WRAS wording are listed below by option.
Check the complete variant description carefully: potable, non-potable and CAT 5 options are not interchangeable. Confirm usable capacity, intended orientation, support, access, outlet, inlet and overflow arrangement before ordering. A baffled tank is not automatically approved for transporting water, and a Type AB tank must form part of a correctly designed compliant installation.
CAT 5 selection guide
For the two Type AB options in this mixed range, read Enduramaxx’s Fluid Category 5 air-gap guide (PDF). It explains the purpose of the weir; confirm the exact inlet and overall dimensions of the selected tank before ordering. The manufacturer drawings supplied on 2 November 2026 show overall heights of 1,594 mm for the 500 L CAT 5 tank and 1,795 mm for the 1,000 L CAT 5 tank, including the illustrated air-gap turrets. Confirm the required inlet arrangement and allow maintenance clearance.
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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