Press Fit Pressure
thanks for the response. The reason I went with a press fit is because the design dictated that kind of fit.
A disposable unit (plastic except for the tubing) was needed as well as allowing the ID of the tube to run the lenght of the unit. A press fit will allow a simple design while still maintaing the necessary requirements. Also, there's no suction or fluid transfer occuring, so we're not overly concerned with hermetic seals. This design is for a guide tube of sorts. It's still in the design phase, that's why I'm checking on the torque.
By the way, anyone have an general guess-timate on what kind of torque the average adult could create in an act like turning a door know (that's about the size of our instruments).