Hi all I'm after advice I had a look on the underside of my tank on the bike today it looks like two taps underneath go in the tank ? One each side with two bolts I looked on CSM it only shows the one on the left side underneath goes Into the tank so the right underside of the tank tap side what is it and does it just bolt onto the tank not go into the tank just can't work out if only one hole in the underside or two I ordered one new O Ring hope you know what I'm on about guys

Is this the vacuum does it just bolt on the underside and no go into a hole for the tank before I strip off the tank lol