A20 Expansion Tank (eliminates pulsation, constant flow, absorbs water hammer, 0.3kg, for all pumps)
Smoother water flow. Quieter pumps. Longer pump life. The Fiamma A20 is a compact expansion/accumulator tank that fits on the pressure side of your 12V water pump to eliminate pulsation, absorb water hammer, and deliver a steady, constant flow at the tap. At just 0.3 kg, it’s an easy upgrade with a big impact on comfort.
Why add the A20?
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Eliminates pulsation – stops the on/off “surging” you feel at the tap.
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Constant, even flow – smoother showers and quicker washing-up.
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Quieter system – reduces pump chatter and pipe vibration.
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Protects your plumbing – cushions pressure spikes (water hammer).
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Extends pump life – fewer rapid cycles means less wear and lower power draw.
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Compact & lightweight – easy to place close to the pump in tight lockers.
Compatibility
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Works with all common 12V diaphragm pumps in campervans, motorhomes, caravans and boats (e.g., Fiamma, Shurflo, Whale).
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Installs in-line on the pressure side (outlet) of the pump.
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Suits standard flexible hose systems; adapters can be used for push-fit plumbing.
How it works
An internal air chamber sits behind a diaphragm. As the pump runs, the A20 stores a little pressure and then feeds it back, smoothing out flow, reducing cycling, and absorbing shocks when taps open/close.
Tech specs
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Product: Fiamma A20 Expansion Tank
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Function: Accumulator/expansion tank for 12V water systems
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Weight: 0.3 kg
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Mounting orientation: Any (upright recommended if space allows)
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Connections: For standard camper hose (use appropriate barbed or push-fit adapters to match your system)
What’s included
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Fiamma A20 expansion tank
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Basic fitting guidance
Installation notes
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Fit as close as practical to the pump outlet (between pump and first tap/tee).
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Keep hose runs short and supported; avoid tight bends.
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Use suitable adapters and clamps for a leak-free connection.
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After installation, run water and check for leaks, then test flow at low and high openings.
Care & use
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Periodically check clamps and hoses for tightness.
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If you notice new pulsation after a long period, inspect for trapped air or partially blocked strainers and clean as needed.
Our Product Policies
Shipping Processing Times
We aim to process all orders within 1–2 business days.
Please note: orders are not dispatched or delivered on weekends.
In periods of high demand, dispatch may be delayed slightly. If there’s a significant delay, we’ll contact you directly via email or phone.
Free Standard Delivery on Orders Over £150 All items ship from our UK warehouse.
See more on our Policy Page
Refund & Returns
We are happy to accept all our items back within 60 days for a full refund. To be eligible for a return the item must be unused and within the original packaging. If 60 days has gone by since your purchase, unfortunately we cannot offer you a refund or exchange. To complete a return please include a copy of your invoice or order details. Please do not send your purchase back to the manufacturer.
If your item arrives damaged or develops a fault, please contact our customer service team at: onlinesales@myfiamma.co.uk
for more details see our refund policy page
Contact Us
how to best get in contact
Email:📧onlinesales@myfiamma.co.uk Our team will get back to you as quickly as possible, typically within 24 hours on weekdays.
Opening Hours, We’re available to assist you during the following hours:
- Monday – Friday: 8:30am – 4:30pm
- Saturday & Sunday: 10:00am – 3:00pm
- Bank Holidays: Closed
Currently, we offer support via email only to provide the fastest and most efficient response to your inquiries.
Related categories
FAQ's
Are Fiamma products universal?
No — Fiamma products are model-specific. Always check the technical sheet and compatibility notes before buying. Our blog and product guides explain the key differences between F45, F80, and other models.
How long does delivery take for Fiamma products?
Most items are dispatched the same day if ordered before 2pm (Mon–Fri). Standard UK delivery is 2–3 working days with tracking provided.
Can I return a Fiamma product if it doesn’t fit?
Yes — unused items can be returned within 60 days. Please keep all packaging intact and delivery information, so we can re-process your return smoothly.
Do I need extra brackets or adapters with this Fiamma product?
Some vehicles require a specific fitting kit or bracket (especially for awnings, bike racks and roof rails). If a kit is needed, we’ll highlight it in the product description.
Do you sell fitting kits and adapters?
Yes — many Fiamma products require a specific fitting kit or adapter depending on your vehicle make and model. Where possible, we’ll show the correct kit directly on the product page or under Accessories. If you’re unsure, use our Kit Finder tool to check compatibility with your campervan, motorhome or caravan — it’s the quickest way to make sure you order the right setup.
How do I measure my awning to choose the right Privacy Room or panel?
Check the awning series (F45, F80, Caravanstore, etc.) and the length/code on the product badge. Measure the awning case length and floor-to-awning height to pick the correct size.
Can I collect from you?
Collection can be arranged on request for most items — and often saves you delivery fees — check the product page to see if the item is available or contact support.
Why choose Fiamma over other brands?
Fiamma products are designed in Italy, with TÜV-approved safety standards and long-lasting materials. They’re known across Europe for quality, reliability, and compatibility with motorhomes and campervans.
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