These JOWIN bellow flex vacuum pump fittings follow ISO-KF standards and have a flange size of NW-16. Bellow hose are commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble.
Note:
from 100mm to 1 meters use super flexible hose.
from 1.2 meters to 4 meters use common flexible hose, because it is long enough, no need super flexible type commonly.
