In my last message, I explained the method I use for sealing taper threads - when they can't be 'engineered out'.

When it comes to tightening taper-thread connections, you must exercise a degree of caution.

Not enough torque and the joint will leak.

But excessive torque can result in broken housings on pumps and valves - due to the force developed by the wedge action of the tapered adaptor.

And when it comes to taper-threads, this is about as scientific as it gets.

By Brendan Casey