FWIW i have tried all the pw's out there, the cnc, WM, swc, cv, ppw. The ppw pulls around 34-37scfh hooked up to my mini cone, the swc does 32-34, the cnc and wm do 32 and cv does 13-17scfh. The ppw does give me start up problems sometimes. The others do not. Not sure if its my sicce pump...