Home / About us
About us
Water leak test systems are a service of AKS Anlagen, Konstruktion und Service GmbH for vehicle manufacturers of all kinds – from cars and commercial vehicles to rail vehicles and motorhomes – as well as for manufacturers of electrical components, assemblies and machines. In everyday use, the term “rain test” (Regenprobe) is often used for this – an informal name for the test procedure, not a brand of its own.
Part of AKS GmbH.
As a builder of bespoke machines with development, design engineering and manufacturing under one roof and a partner network of more than 30 specialists, AKS GmbH brings its full manufacturing depth to every water leak test system. Certified to DIN EN ISO 9001, certified welding company to EN 1090-2 up to EXC2.
A history of more than 30 years of experience
The roots of our water leak test systems go back to 1990: that year, Dipl.-Ing. Uwe Geerken and Franz Ross founded the engineering firm “G+R GmbH”, initially providing engineering for bespoke machines. From 1996, the firm also established itself as a general contractor for water leak test systems in the automotive industry. After moving to Nideggen in 2012, the company continued as “Ingenieurbüro Geerken GmbH”. Since 2018, the systems have been manufactured in cooperation with AKS GmbH in Sprockhövel – the beginning of a close partnership that led to AKS GmbH taking over the business area completely in 2026, after Geerken ceased operations.
1990
Founded as engineering firm G+R GmbH by Uwe Geerken and Franz Ross
1996
Established as general contractor for water leak test systems
2012
Move to Nideggen, renamed Ingenieurbüro Geerken GmbH
2018
Start of manufacturing in cooperation with AKS GmbH in Sprockhövel
2026
AKS GmbH takes over the business area completely
What is a leak test?
In a leak test – often also called a rain test or water test – a vehicle is sprayed with water from all sides. While it is being sprayed, an employee checks the vehicle from the inside for water ingress or leaks. This reliably detects leaks at windows, doors, weld seams and other critical points before the vehicle is delivered. We have already built such systems for cars, commercial vehicles, trains, buses and motorhomes; we use the same principle to test electrical components, individual assemblies and machines.
Because we build bespoke machines, we do not work with a fixed modular kit: for every inquiry, we develop, plan, build and implement the system to suit the vehicle size, cycle time and place of use – whether fully integrated into a series production line, transportable or designed for targeted audits.
Challenge us
Have a testing task? We build the right system.
Briefly describe your project – the test object (vehicle, component or machine), quantity and place of use are usually enough for an initial assessment.