The bottom of the float bowls has 1 brass nipple each, those are for drainining fuel (what you are holding is the drain pipes)
1 front 1 rear and joins at a Tee Junction —> Long hose goes to the road. (This is why next time we drain carbs before removal, we loose the silver float screws directly under the brass nippe) ==> then the long hose drains fuel in to the bucket on the road (or garage if you will) – I say road because i know some houses here in UK do not have long drive ways or big back yards , they fix their cars/bikes on the street/road 😉