Brass 21.8lh to POL adaptor for Generation 2 tanks with the manual 21.8 Left hand outlet tap.
If you have a POL regulator and want to fit it to a GAS IT Generation 2 gas tank ( with a black airbox) and manual outlet tap only then this adaptor will do the job.
It's overall length is 108 mm without your regulator fitted.
This will work with other companies gas tanks with a 21.8LH outlet also.