---
product_id: 55160751
title: "Aquasystem 18 Litre Potable Expansion Vessel with 3/4\" Connection"
brand: "aquasystems"
price: "₨68175"
currency: LKR
in_stock: true
reviews_count: 8
category: "Aquasystems"
url: https://www.desertcart.lk/products/55160751-aquasystem-18-litre-potable-expansion-vessel-with-3-4-connection
store_origin: LK
region: Sri Lanka
---

# 18L Capacity Replaceable Membrane Stainless Steel Flange Aquasystem 18 Litre Potable Expansion Vessel with 3/4" Connection

**Brand:** aquasystems
**Price:** ₨68175
**Availability:** ✅ In Stock

## Summary

> 💧 Stay Hydrated, Stay Ahead!

## Quick Answers

- **What is this?** Aquasystem 18 Litre Potable Expansion Vessel with 3/4" Connection by aquasystems
- **How much does it cost?** ₨68175 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/55160751-aquasystem-18-litre-potable-expansion-vessel-with-3-4-connection)

## Best For

- aquasystems enthusiasts

## Why This Product

- Trusted aquasystems brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable Design:** Crafted with a white epoxy-coated steel container for longevity.
- • **Easy Maintenance:** Features a replaceable EPDM membrane for hassle-free upkeep.
- • **Unmatched Capacity:** Store up to 18 litres of potable water effortlessly.
- • **Robust Construction:** Bolted stainless steel flange ensures maximum durability.
- • **High-Pressure Performance:** Handles up to 10 bar pressure for reliable performance.

## Overview

The Aquasystem 18 Litre Potable Expansion Vessel is engineered for efficiency and durability, featuring a robust white epoxy-coated steel container, a replaceable EPDM membrane, and a bolted stainless steel flange, all designed to withstand a maximum pressure of 10 bar. Perfect for modern water management needs.

## Description

18 Litre Replaceable Membrane Potable Water Expansion Vessel Tank * 18 Litre * White Epoxy Coated Steel Container * Replaceable EPDM Membrane * Bolted Stainless Steel Flange * Maximum Pressure: 10 Bar * Pre-set Charge Pressure: 3 Bar * 3/4" MBSP Connection * WRAS Approved An expansion vessel for potable water. It is manufactured to comply with UK water regulations and are tested and certified by WRAS. All vessels are supplied with a replaceable membrane. It separates the water and air to prevent contamination of the water system, corrosion of the vessel and pressure loss in the water system. The main purpose of the vessel is to compensate for the increase in volume of water due to the increases in temperature.

Review: Good product - Good
Review: 1st class - Arrived on time, great condition and reasonable cost

## Features

- Capacity: 18 Litre
- White Epoxy Coated Steel Container
- Replaceable EPDM Membrane
- Bolted Stainless Steel Flange
- Maximum Pressure: 10 Bar

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Reliance Water Controls |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |

## Images

![Aquasystem 18 Litre Potable Expansion Vessel with 3/4" Connection - Image 1](https://m.media-amazon.com/images/I/51pecp7bJCL.jpg)

## Questions & Answers

**Q: What are the dimensions of this product?**
A: Dimensions: D-280.00mm H-465.00mm

**Q: Will this work in curing resin**
A: Hi,

Thank you for contacting.

This expansion vessel is purely designed for Potable / Main water systems only and the manufacturer would not recommend for anything else such as curing resin. By doing this it would invalidate any warranty applied to it. 

Hope this helps, 

Regards

**Q: Please can you confirm manufacturer name and model number that will be supplied**
A: Good morning, the manufacture is Reliance water controls and the model is AR18. 
Regards

**Q: could this vessel be used for compressed air @ 6bar?**
A: I would not advise this expansion vessel to be used for compressed gas at 6 bar. The vessel is meant to be used for potable water at 3 bar maximum.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product
*by J***. on 6 August 2025*

Good

### ⭐⭐⭐⭐⭐ 1st class
*by A***R on 22 March 2021*

Arrived on time, great condition and reasonable cost

### ⭐⭐⭐⭐⭐ expansion vessel
*by I***S on 30 May 2021*

great value compared to usual retail

## Frequently Bought Together

- Aquasystem 18 Litre Potable Expansion Vessel with 3/4" Connection
- Caleffi Multibloc Cold Water Control Valve 533112CST 3 & 6 Bar - Circlip
- Zilmet - Ultra Pro 12 Litre Potable Expansion Vessel C/W Bracket 1100001220

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**Shop now:** [https://www.desertcart.lk/products/55160751-aquasystem-18-litre-potable-expansion-vessel-with-3-4-connection](https://www.desertcart.lk/products/55160751-aquasystem-18-litre-potable-expansion-vessel-with-3-4-connection)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-25*