How many people are required on site for tank delivery?
The good news is that no-one is required to help the driver unload.  Please provide a free and easy access to your site and an identified ‘marked’ area for the tank to be unloaded. Our driver will unload as close as possible your desired location. If the driver deems the desired location to be too difficult to manoeuvre the truck into, the driver will identify a safe and secure place to unload within your property.   Please note: The driver is unable to physically position the tank onto the ‘pad’. Exact positioning of the tank on the pad remains the responsibility of the property owner.
Can I weld my own fittings on the tank?
We do not recommend that you weld your own fittings as it will void the warranty and our staff are experienced and qualified in poly welding. Polyethylene welding needs surface preparation, compatible resin filler rods for welding and the appropriate fittings for the welding to be successful.
Do your tanks come with lifting lugs?
Yes, all Polymaster tanks have moulded lifting lugs that can be used when the tank is retaining its one-piece configuration. If the tank is a bunded or has had its roof removed for access reasons, then the lifting lugs will need to be welded onto the wall of the tank if required.
My tank is bulging?
It can be quite normal for a tank to bulge, due to the properties of the polymer (plastic) used to mould the tank. We quality test our tanks to ensure they are manufactured within tolerances and stand behind our warranties. If you are still concerned, please take some photos and email them to our aftersales team on
What type of base does my tank need to sit on?
The foundation that your tank sits on is critical to ensure that it is supported adequately without the risk of causing fatigue to the tank and potential failure. To correctly install your rainwater tank, it must be placed on a firm, level and flat base, free from any rocks, stones and sharp edges. A concrete pad is recommended, however, a compacted sand base or other consolidated fill such as crusher dust is also suitable. The base must be thoroughly compacted and be exactly level and flat in all directions and should be 75-100mm deep and at least 600mm larger in diameter than the tank base. The outsides of the base must be supported by a retaining wall of some kind to ensure that no erosion can occur through washout, vermin or any other factor. Failure to provide a stable base will void the warranty.   It is important to check the base on an annual basis to ensure it hasn’t eroded, as this may affect the structure of the tanks. If the foundation is not concrete, it’s ideal to have a roof structure over the tank for drainage - Consult the Installation and Operation Manual of the manufacturer for more details. If you have a chemical tank the slab needs to be engineered to support the weight of the tank without flexing or breaking.
Can I have extra or upgraded fittings on my tank?
Polymaster tanks can have as many fittings as required by you. Standard tanks come with 1 x outlet, 1 x ball valve and 1 x inlet. So, any fittings required above this do incur additional charges. This is also the case with upgrading fittings. The standard fittings on the tank can be upgraded to any size you require. Additional charges will apply. Our outlets and ball valves can range from as small as 1” to 4”(25mm to 100mm).
Can I put my outlet half way up the tank wall?
Yes, you can if you have one of our smooth wall tanks.  Outlets can be fitted anywhere there is a smooth surface on the tank wall. This is not so straight-forward with our corrugated tanks. Each of these tanks have a ‘flat spot’ on the tank where the outlet can be fitted. There is one flat spot on each tank that is located at a specific location. The position of this flat spot varies according to the size of the tank. See below table for the location of the ‘flat spot’ on each tank.
What fittings will my tank come with?
All Polymaster tanks have standard fittings when purchased. These fittings vary slightly according to our different tank ranges. Our Premium Corrugated tanks and Slendastyle tanks come standard with:
  • Inlet with leaf screen/strainer
  • 1 x 90mm overflow
  • 1 x brass outlet
  • 1 x brass ball valve
Our Smooth Wall tanks and Polychoice slim tanks come standard with:
  • Inlet and leaf screen/strainer
  • 1 x 90mm overflow
  • 1 x brass outlet
The outlets and ball valves also can vary in size depending on the size of the tank:
  • 200ltr – 5,000ltr tanks = 1” (25mm) outlet & ball valve
  • 7,100ltr – 50,000ltr tanks = 1 ½” (40mm) outlet & ball vale
The brass outlet will always be fitted to the tank and fitted with the protection thread cap. The ball valve is supplied loose, unless specified otherwise. Other fittings are available upon request.
Where can I position my tank fittings?
Each style and tank size have different available fitting positions. Therefore, refer to table below to find the fitting positions for your preferred tank. Premium Round Tanks:premium round tanks Polychoice Round Tanks: polychoice round tanks Slendastyle Tanks:slendastyle tanks Polychoice Slendastyle Tanks:polychoice slendastyle tanks
Can my tank be partially buried?
We do not recommend burying a rainwater tank. Polymaster have specifically designed Underground Water Tanks which can be buried under the surface.