If you are talking about this
This is what I did and should of done
you will need a small cup and a wrench..
Crack the fitting and let it slowly drain into a small cup.. ( Small cup fits under mine) Yes, it will take awhile
After it is drained down enough to pull fitting all the way apart turn the cat pump clutch by hand and it will turn the pump and pump out the left overs
I had a major brain fart when I was done with mine and had it all refilled......
I should of taken a "T" and put it in line and added a drain hose This would of allowed me to use a hand pump and suck it out next time
The hose can't be under that much pressure.. They used the squeze clamps instead of high presure fittings so it would not have a problem
Another way would be to get under truck and pull lowest hose but I could not get to mine