---
product_id: 55160788
title: "20-24L Membrane Pressure Tank Vessel Expansion for Domestic Waterworks Butyl"
brand: "wiltec"
price: "$46"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/55160788-20-24l-membrane-pressure-tank-vessel-expansion-for-domestic-waterworks
store_origin: NZ
region: New Zealand
---

# 20-24L capacity for versatile water systems Withstands temperatures from -70°C to 100°C Easily replaceable butyl rubber membrane 20-24L Membrane Pressure Tank Vessel Expansion for Domestic Waterworks Butyl

**Brand:** wiltec
**Price:** $46
**Availability:** ✅ In Stock

## Summary

> 💧 Upgrade your water system with seamless durability and peace of mind!

## Quick Answers

- **What is this?** 20-24L Membrane Pressure Tank Vessel Expansion for Domestic Waterworks Butyl by wiltec
- **How much does it cost?** $46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/55160788-20-24l-membrane-pressure-tank-vessel-expansion-for-domestic-waterworks)

## Best For

- wiltec enthusiasts

## Why This Product

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

## Key Features

- • **Premium Butyl Rubber:** Durable, chemical-resistant, and safe for drinking water applications
- • **Universal Fit Reminder:** Compatible with most 20-24L tanks—just check your dimensions to avoid surprises
- • **Effortless Membrane Swap:** Quick and hassle-free replacement keeps your system running smoothly
- • **Silent & Shock Absorbing:** Reduces noise and vibration for a peaceful home environment
- • **Wide Temperature Resilience:** Maintains elasticity from freezing cold to hot water conditions

## Overview

This 20-24L membrane pressure tank vessel expansion membrane by WilTec features a butyl rubber construction that ensures chemical resistance, low gas permeability, and elasticity from -70°C to 100°C. Designed for easy replacement in domestic waterworks, solar, and garden pump systems, it is safe for drinking water and compatible with most conventional tanks in this size range.

## Description

The replacement membrane for most of the conventional 20–24-litre pressure vessels, for use in sanitary cold-/hot water systems, domestic waterworks, solar- and pressure maintenance systems, and garden pumps. The membrane is made of butyl rubber, and therefore suitable for drinking water.  Butyl rubber:  This rubber belongs to the group of elastomers. This synthetic material is characterised by resistance to hot air, weathering, and ozone. The elastomer shows low gas permeability, good resistance to chemicals as well as up to 100 °C very good noise and shock energy absorption qualities.   In the low temperature range, the butyl rubber remains elastic up to −70 °C. It is mainly used for air hoses and inner cores of tyres, bladders, steam hoses, and linings for tanks. Further fields of application are foils, membranes, unvulcanised sealants, and bands.  Butyl rubber is also referred to as IIR (isobutene-isoprene rubber).

## Features

- The membrane can be replaced easily.
- The membrane is suitable for drinking water.
- For tanks of other suppliers, please pay attention to the dimensions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | WilTec |
| Part Number | 50603 |
| Product Dimensions | 20 x 20 x 24 cm; 340 g |
| Item model number | 50603 |
| Colour | Black |
| Style | 20-24 l |
| Material | Rubber |
| Shape | 20-24 l |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 340 g |

## Product Details

- **Brand:** WilTec
- **Material:** Rubber
- **Colour:** Black
- **Item weight:** 0.34 Kilograms
- **Maximum pressure:** 5.4 Bars
- **Nominal wall thickness:** 2.5 millimeters
- **Item length:** 240 Millimetres
- **Manufacturer:** WilTec

## Images

![20-24L Membrane Pressure Tank Vessel Expansion for Domestic Waterworks Butyl - Image 1](https://m.media-amazon.com/images/I/511+nBvEWKL.jpg)

## Available Options

This product comes in different **Item Shape** options.

## Frequently Bought Together

- 20-24L Membrane Pressure Tank Vessel Expansion for Domestic Waterworks Butyl
- Pressure Tank 24L Vessel Water with EPDM Membrane for Domestic Waterworks Pump
- 20-24L Replacement Membrane Pressure Tank Vessel Expansion for Domestic Waterworks

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**Shop now:** [https://www.desertcart.nz/products/55160788-20-24l-membrane-pressure-tank-vessel-expansion-for-domestic-waterworks](https://www.desertcart.nz/products/55160788-20-24l-membrane-pressure-tank-vessel-expansion-for-domestic-waterworks)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-27*