If you’re building or upgrading your 4WD, caravan, or camper trailer, you know how precious every inch of space is. A reliable water tank that fits tight chassis gaps, under ute trays, or small storage areas is non-negotiable for off-grid adventures. That’s where the MKK GROUP 43L Modular Water Tank shines — compact, tough, and built to keep your water supply safe on the road.
Easy Installation & Fitting Guide
Setting up your 43L modular water tank is straightforward, even if you’re new to plumbing your rig. Follow these simple steps for a leak-free, secure installation:
Prepare the tank: All fittings use standard 20mm (3/4 BSP) thread. You can use your own compatible fittings, or purchase them from your local plumbing/hardware store.
Seal the connections: Wrap Teflon tape (plumber’s tape) around the fitting threads before screwing them into the tank. This ensures a watertight seal — never skip this step!
Install carefully: Screw fittings into the tank by hand first, then tighten gently. Do not cross-thread fittings, as this can damage the tank’s threads and cause leaks.
Add a breather hole: Once your installation is finalised, drill a simple breather hole to allow air into the tank as water flows out. This prevents a vacuum lock that can stop your water pump from working.
Secure the tank: Mount the tank with protective brackets, and add foam padding underneath to reduce wear and vibration during travel. This simple step will extend the life of your tank significantly
Why Choose the 43L Modular Water Tank for Your Setup?
Unlike bulky one-size-fits-all tanks, this 43L modular water tank is designed for versatility and durability. Let’s break down why it’s a favourite among off-roaders and caravan owners alike:
1. Compact Size, Maximum Capacity
Measuring 860(L) x 260(W) x 220(H) mm, this tank fits perfectly in tight spaces most other tanks can’t reach — think between chassis rails, under ute trays, or in small camper storage bays. At only 2.5kg, it’s lightweight enough to avoid weighing down your vehicle, while still giving you 43 litres of dependable water storage for short weekend trips or extended off-grid stays.
2. Food-Grade & Built to Last
Constructed from food-contact approved high-density polyethylene (HDPE), this tank is safe for storing drinking water, and its tough blow-moulded construction stands up to vibration, rough roads, and harsh weather conditions. Whether you’re navigating corrugated outback tracks or bumpy forest trails, this tank won’t crack, leak, or degrade easily — backed by a 1-year warranty for complete peace of mind.
3. Fully Customisable Plumbing
Two integral 20mm (¾ BSP) threaded connections give you complete flexibility to build your ideal water system:
Connect directly to 12V water pumps, filters, water inlets, or sender probes
Link multiple tanks in parallel to expand your water capacity (we offer 2x 43L and 3x 43L modular tank packs for larger setups)
Use it as both a fresh water tank or a grey water tank (pair with 20–25mm hose and fittings for grey water use)
Common Questions About the 43L Modular Water Tank
Can I stack multiple tanks together?
Absolutely! The modular design lets you network multiple 43L tanks in parallel to create a custom water system. For example, 2 tanks give you 86L total capacity, while 3 tanks give you 129L — perfect for long trips or larger rigs.
Is this tank suitable for grey water tank?
Yes. This tank is suitable for use as a grey water tank to hold sink and shower wastewater when plumbed with 20–25mm hose and compatible fittings.
Do I need special tools to install it?
No special tools are required for basic installation. You’ll just need a drill (for the breather hole), Teflon tape, and basic hand tools to mount the brackets.
Ready to Upgrade Your Water Storage?
The MKK GROUP 43L Modular Water Tank is more than just a container — it’s a reliable, space-saving solution designed to keep your adventures flowing. Whether you’re heading out for a weekend camping trip or a cross-country outback journey, this tank delivers the durability and flexibility you need.
Explore the full range of modular water tanks and accessories for your 4WD, caravan, or camper trailer:
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