I have a clean out on my home sewer plumbing system that has a 90 degree fitting facing up with a cap that I use. It's right off my driveway. Works great!
Robert & Phyllis
Peyton-13 & Ashlynn-11
2008 KZ Spree 289RKS TT
1993 CK1500 Ext. Cab
5.7, W/3.73,
custom paint on tv
Im sure that would work. Ive never had it done before so.... But im guessing if they do it all the time (honey wagon service) then I would think they're aware of the pressure issues and maybe they tone it down a little bit.