Enduramaxx CAT 5 Type AB Vertical Tanks
Selected tank: 500 L
- Model / SKU
- 17250701CAT5
- Nominal capacity
- 500 litres
- Tank type
- CAT 5 Type AB air-gap break tank
- Dimensions
- Ø 700 × H 2095 mm (manufacturer-listed nominal size)
- 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
Selected tank: 2,000 L
- Model / SKU
- 17220801CAT5
- Nominal capacity
- 2,000 litres
- Tank type
- CAT 5 Type AB air-gap break tank
- Dimensions
- Ø 1200 × H 2332 / 2532 mm (height depends on inlet option)
- Discharge / outlet
- 1½-inch BSP outlet (standard manufacturer-listed size)
- Included lid
- 620 mm nominal lid diameter
- Clear access opening
- Not separately confirmed. Lid/cover dimensions are not a guaranteed clear opening.
- Inlet / air gap
- Up to 32 mm or up to 50 mm; confirm supplied inlet option before ordering
H2332 mm for an inlet up to 32 mm; H2532 mm for an inlet up to 50 mm. Select the required inlet/weir configuration.
Need help choosing fittings for this tank? Contact us for advice on compatible valves and adaptors.
These Enduramaxx vertical break tanks incorporate a Type AB air-gap weir to help protect a mains water supply against Fluid Category 5 backflow risk. They are intended for correctly designed booster, irrigation, process-water and commercial water-storage installations requiring a physical air gap.
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 17250701CAT5 |
Ø 700 × H 2095 |
1½-inch male BSP | 455 |
|
2,000 L 17220801CAT5 |
Ø 1200 × H 2332 32 mm inlet configuration. Enduramaxx confirms its smaller CAT 5 tanks are supplied only with the 32 mm inlet option. |
1½-inch male BSP | 620 |
Available variants
- 500 litre CAT 5 Type AB tank
- 2,000 litre tank
Each black tank is rotationally moulded from medium-density polyethylene. The full specifications below give diameter, height, lid and BSP outlet by option.
Selection guidance
Choose the usable storage volume from demand, incoming mains flow and pump duty rather than nominal tank size alone. Enduramaxx confirms the smaller CAT 5 tanks are supplied with the 32 mm inlet option; the 2,000 L dimensions in this listing refer to that configuration. Check the exact weir and permitted inlet arrangement, overflow route, outlet size, access, base, offloading and installation space before ordering. A Type AB tank must still be installed as part of a compliant system under the applicable Water Fittings Regulations.
See the supporting gallery guide for Enduramaxx’s base preparation and positioning requirements for above-ground tanks up to 2,500 litres, covering both options here. Preserve the specified Type AB air-gap and weir arrangement; the complete installation and air-gap guides below remain available. Lift the tank only when empty. Tank entry requires suitable confined-space controls against lack of oxygen and hazardous vapours.
Manufacturer technical information
- 500 L CAT 5 size guide in the product images - confirms the 700 mm diameter and 2,095 mm height for SKU 17250701CAT5.
- Vertical above-ground tank installation guide (PDF) - handling, base and connection guidance.
- Fluid Category 5 air-gap explanation (PDF) - general Type AB information.
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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