Keep it simple....no need for that extra Festo.......1/8" Tygon tubing of desired length to fill port on UAT.....use Dubro plug that BV includes with the UAT....been using it for 3 years on my HS, 2 years on my Bandits, and all summer on my KC.....BV uses it on all his jets....never had a leak.....worst problem is dropping the plug in the grass.....I keep a few spares.....I use a Jersey Fueler and the supplied filler fits tightly in the Tygon....or you can make your own with a short piece of brass tubing.....

I do use 6mm tubing with an On/Off Festo in the line between the output of the UAT and the Fuel Pump.....suction side, of course......never has leaked either.....just make sure you have a very clean cut on the tubing....

Tom