The dual tank adaptor will not work for this application.
It consists of a 1/8 BSP Swivelable 6mm tee and a rank adaptor. In your case, you need 1x 6mm to 1/8BSP and a tank adaptor. Need to purchase it separately. You can get the tank and fittings from:
http://www.howertonengineering.com. whom holds good stock of tanks and selection of fittings.