---
title: Bag in Tank System
description: Discover the Bag-in-Tank system for efficient beer dispensing using compressed air, ensuring freshness and easy inliner replacement for optimal performance
---
[](https://duotank.com/en/?hsLang=en)
- [English](https://duotank.com/bag-in-tank-system)
- [Deutsch – Deutschland](https://duotank.com/de-de/bag-in-tank-system)
- [Français - France](https://duotank.com/fr-fr/bag-in-tank-system)
- [Nederlands](https://duotank.com/nl/bag-in-tank-system)
- Applications
- [Hospitality and Tank Beer](https://duotank.com/hospitality-and-tank-beer?hsLang=en)
- [Tank Beer on Events](https://duotank.com/tank-beer-on-events?hsLang=en)
- [Tank Beer Transport](https://duotank.com/tank-beer-transport?hsLang=en)
- [Tank Beer for Microbreweries](https://duotank.com/tank-beer-for-microbreweries?hsLang=en)
- Tank Beer System
- [System Overview](https://duotank.com/how-a-tank-beer-system-works?hsLang=en)
- [Bag In Tank Principle](https://duotank.com/bag-in-tank-system)
- [Duotank Inliner](https://duotank.com/inliners?hsLang=en)
- Products
- [Next Gen Tank](https://duotank.com/the-next-gen-tank?hsLang=en)
- [Venue Tanks and Equipment](https://duotank.com/venue-tanks-and-equipment?hsLang=en)
- [Event Tanks and Equipment](https://duotank.com/event-tanks-and-equipment?hsLang=en)
- Transport Tanks and Equipment
- [Transport Tanks and Equipment](https://duotank.com/transport-tanks-and-equipment?hsLang=en)
- [Delivery Units](https://duotank.com/delivery-units?hsLang=en)
- [LGT- Lightweight Truck](https://duotank.com/lightweight-truck?hsLang=en)
- [Bulk Transport](https://duotank.com/bulk-transport?hsLang=en)
- [Duotank System Online](https://duotank.com/duotank-system-online?hsLang=en)
- [Compliance](https://duotank.com/sustainability-and-certification?hsLang=en)
- [About us](https://duotank.com/about?hsLang=en)
- [Blog](https://duotank.com/blog?hsLang=en)
- [English](https://duotank.com/bag-in-tank-system)
- [Deutsch – Deutschland](https://duotank.com/de-de/bag-in-tank-system)
- [Français - France](https://duotank.com/fr-fr/bag-in-tank-system)
- [Nederlands](https://duotank.com/nl/bag-in-tank-system)
[Vacancies](https://werkenbij.duotank.nl/) [Contact us](https://duotank.com/contact?hsLang=en)
## **Bag-In-Tank Principle The system explained**
GET YOUR MANUAL [GO TO TANK BEER SYSTEM](https://duotank.com/how-a-tank-beer-system-works?hsLang=en)
Clarification
The Bag-in-Tank system does not work with CO2 or other gases, but only with compressed air. First, an inliner is placed in the tank. By connecting a plug-in tap to the inliner, it can be filled directly with beer. For this purpose, the piercing unit connected to a filling hose (from a beer truck, for example). During the filling of the inliner, air is pressed out of the beer tank via the safety valve with a pressure regulator at the front of the beer tank.
When the inliner is filled, the pressure regulator of the safety valve is used to force compressed air into the tank. With this compressed air, the beer in the inliner is kept under pressure and pushed out of the tank during tapping. The beer leaves the tank through the piercing unit that is connected to a python, which is connected to the bar
LEARN
### **Tank Beer: The Most Sustainable Way of Beer Dispensing**
READ THE BLOG
EBOOK
### Get our manual on ''How to change an inliner''.
Download our free manual and get the complete instructions on changing an inliner.
GET THE MANUAL
DETAILS
### Watch our short video to learn how a bag in tank system works.
For more detailed information, please visit the installation page.
[GO TO INSTALLATION PAGE](https://duotank.com/how-a-tank-beer-system-works?hsLang=en) GET THE MANUAL
FAQ
## Frequently Asked Questions About Inliners
### What material is the inliner made of?
The inliners are made of LLDPE material. This material is specially certified for preserving food and beverages. An oxygen barrier called EVOH has been added to the LLDPE to keep oxygen out.
### How often do I need to change the inliner?
The inliner is generally replaced when it is empty and you are going to refill the tank with beer.
### Does Duotank supply the inliners?
Yes, you can order the inliners from Duotank.
### How long does it take to change an inliner?
Replacing the inliner, including reconnecting the tank, takes approximately 2 minutes.
### How much does an inliner cost?
The price of an inliner ranges from **€15 to €28,** depending on the size, type of connection, and order quantity.
Please contact our sales department by sending an email to [sales@duotank.nl](mailto:sales@duotank.nl) for advice on the most suitable inliner for your application and for pricing information.
[](https://duotank.com/en/?hsLang=en)
Petunialaan 5
5582 HA Waalre
The Netherlands
+31 402212272
sales@duotank.nl
### Solutions
- [Hospitality and Tank Beer](https://duotank.com/hospitality-and-tank-beer?hsLang=en)
- [Tank Beer on Events](https://duotank.com/tank-beer-on-events?hsLang=en)
- [Tank Beer Transport](https://duotank.com/tank-beer-transport?hsLang=en)
- [Tank Beer for Microbreweries](https://duotank.com/tank-beer-for-microbreweries?hsLang=en)
### Bag in Tank
- [The Bag-In-Tank system](https://duotank.com/bag-in-tank-system)
- [The Duotank Inliner](https://duotank.com/inliners?hsLang=en)
### Products
- [Tank Beer System](https://duotank.com/how-a-tank-beer-system-works?hsLang=en)
- [Event Tanks and Equipment](https://duotank.com/event-tanks-and-equipment?hsLang=en)
- [Transport Tanks and Equipment](https://duotank.com/transport-tanks-and-equipment?hsLang=en)
- [Duotank System Online](https://duotank.com/duotank-system-online?hsLang=en)
### Other
- [Sustainability and Responsibility](https://duotank.com/sustainability-and-certification?hsLang=en)
- [About us](https://duotank.com/about?hsLang=en)
- [Blog](https://duotank.com/blog?hsLang=en)
- [Vacancies](https://werkenbij.duotank.nl/)
- [Contact us](https://duotank.com/contact?hsLang=en)
[Powered by Atlas - a B2B SaaS HubSpot theme](https://www.kalungi.com/atlas-hubspot-theme-for-b2b-saas-software)
[Chat with us](https://wa.me/310402212272?text=Hi,%20I%20would%20like%20to%20ask%20you%20a%20question.)