The STRAIGHT FLUSH system from Fog Agroteknik is VA-approved 

As an extra quality assurance the STRAIGHT FLUSH system by Fog Agroteknik has been VA-approved. This is a quality assurance besides the requirements from the authorities. The VA- approval is needed when establishing water supplies and sewers, but not when establishing the STRAIGHT FLUSH system.

By a VA- approval is meant an annual test of the products, done by the Technological Institute.

For instance the connecting pieces are laid in a frozen down, and thereafter dropped on the floor, to test their ability to keep tight. Furthermore they are tested for pressure, to see if they will keep tight during several minutes of load. 

The pulling plugs in the STRAIGHT FLUSH system are weight and pressure proved. The weighing is to make sure they weigh is the same.