RV 80 is a special maschine for tapping of tanks ( train or long vehicle) - made to be used in "accident" -situations.
The tool was constructed with the assistance of an industry-firedept and SRSA
( Swedish Rescue Services Agency) for emergency-situations...
In short, it´s a DN80 valve velded on a plate with rubberisolation, which is mounted on the object You want to tap.
The maschine has been successfully used at an accident with a train-set with Gasol in Norway, and a petroltank-lorry in Malmö/Sweden as examples.