On Monday, May 18, 2015 at 12:27:35 PM UTC-4, Gunner Asch wrote:

Depending on wall thickness..an exacto knife may not work. You may
have to slit it with a saw. Got a table saw? You can make a box, with
a slit in the bottom you can clamp over the table saw blade (or under
radial arm saw blade..and simply pull the hose through while the blade
is running.

Gunner

Gunner, unless you clamp a guide piece to BOTH free ends of that pipe,
such that the guides run flush on the table and totally prevent any
rotation of the pipe, you'll never get a straight cut. It will usually
assume a slow spiral, but can also 'wave'.

LLoyd