That is what we have here, and I seek an eclectic part. My lone French bicycle, a Peugeot UO-8 is fitted with a Ventolux pump, as most were. I am missing the air hose that threads into the bottom of the pump. I have multiple hoses to fit English pumps, but, needless to say, they don’t fit.
It seems to be a 5mm pipe thread. Look about your parts to see if you have a hose that won’t fit your English pumps. We can work something out.
Ted