Ken, it's a simple a DIY and yes $175 is CRAZY ! I don't remember the socket size and I don't recall using the tool to pull it out just my fingers. A couple of drips of DEF R & R and done . I realize it's a 200,000 mile filter but I'm a believer that TIME ages filters ( i.e.: air filter yearly ) and the DEF filter should be changed by years not mileage in our motorhomes.
Sue & Brian Ashworth & Rizzy( adopted Boxer)
2016 Anthem 44A, 2018 GMC Canyon Denali,