On May 12, 4:06*pm, Paul Drahn wrote:
On 5/12/2013 10:05 AM, Danny D wrote: I'm a big believer in doing things the right way, or, at least knowing
what the right way is (so that the next time you do it the right way).

So I ask what seems like a very basic question:
* Q: Does it matter which direction I put these 2" PVC unions on?
* * *http://www4.picturepush.com/photo/a/...g/12915207.jpg

The black and white one seems to be mismatched. I learned the hard way
that even though they seem to go together, the threads may not fully
mate, allowing the outside ring to slip when tightened.

Doh! I warned him about that a few days ago. Said I
wasn't sure that half of one union would mate correctly
with half of another, because they may not be designed
exactly the same. I've never tried to do that because
I'd be concerned about it leaking. And also you have
the other half of the new union whether you use it or not.