I did what is know as the pigtail, the little metal tube coming out of the ptu known as the vent, I put gas line on the vent tube secured with a hose clamp, ran it up to the brake booster and zip tied it, put the breather cap back on the end. I could tell I was a little low on ptu fluid after changing it because the tube hummed and I could smell it since I took off my cowl trim ....in a fit of anger....since replaced since the smell then came in the registers and into the car.....Have not changed it through the tube by sucking it out yet....I used Amsoil....my go to lube-heh heh