On Wed, 26 Jun 2013 13:08:03 -0500, Natural - Smoking Gun - Girl wrote:

You can get the shut off valve that attaches directly to the 1/2" tubing,

That is an option.

Something, I don't know what, seems to me that I'd prefer the permanence
of the PVC shutoff and *then* the less-permanent stuff, such as a
garden-hose thread which is then attached to the rather flimsy tubing.

But thanks for the idea as I hadn't thought of the shut-off valve,
which is just what I need.