My last step in winterizing the plumbing is to close all the faucets,engage the water pump to pump up the system with pinks stuff. When the pump shuts off I go outside to the CW connection, pull the screen out, stand off to the side and reach in with my finger and push the check valve button. It will shoot all the water out along with a stream of pink stuff behind it. Button it up and I'm done.
'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"