How do I screw the Surfprep hose into the sander’s vacuum port? I have tried and cannot get it to go in.

SurfPrep vacuum hoses that screw into the exhaust port of your tool are threaded counterclockwise. This means that when screwing the hose into the vacuum port, you turn it in the opposite direction than the old phrase ” righty tighty, lefty loosey.”  

Line up the hose end into the port and apply medium to firm pressure and turn it from right to left, counterclockwise. You can also hold the hose firmly and turn the blue swivel collar on the tool in a clockwise direction.