This series has no specific own parameters other then the capacity. Within this series, you will find two concepts:
- Type 2500-VFR produced out of our well-known high quality polyurethane.
- Type 2500-PVF(T) produced out of polypropylene and polycarbonate.

The last one resulted out of the wish of some of our clients to have an air inlet valve produced out of a hard plastic and (if necessary) executed with a transparent inner valve.
The insulation value of this inlet is significantly lower.

Click here for general information about the air inlet valves.