Mark, absolutely! Glad to hear it! I know you sleep much better at night that way. Me too!
Jon, yes, exactly, a ball valve. Many thanks!
And Ed, nice point, thank you!
Let me try to explain this point Ed made just to make sure no one gets confused.
First and foremost, we're advocating the quarter-turn valve over the multi-turn valve. That is the key takeaway here. If you remember nothing else about this post, just remember that point! :)
Then, to get a little deeper into the kung-fu of shutoff valves:
There is usually half inch copper tubing coming out of the wall under the sink or near the toilet which carries the water into the room for the sink or toilet. The shut-off valve attaches to this copper tubing.
Now as Ed pointed out, he prefers to have the shut-off valve attach to the tubing by screwing the valve onto the tubing. This would occur if the tubing was threaded at the end to allow for the shutoff valve to be screwed on to the tubing. Valves designed for this have what's called a 1/2 inch FIP Inlet on them.
Here's a photo of one:
The other way of attaching the valve to the tubing (if the end of the tubing is not threaded but is instead smooth) is via a type of valve inlet called a 1/2 inch NOM Comp Inlet. (NOM Comp stands for Nominal Compression, but this isn't important.) That type of attachment uses the compression method of securing the valve to the smooth copper tube. As Ed points out, it can be easy to screw this up. Please note that this compression method of attaching the valve to the tubing has nothing to do with what type of valve we're using. We're still using the quarter-turn valve.
So if the copper tubing coming out of the wall is smooth and not threaded, Ed prefers to have a threaded male adapter sweated onto the smooth copper tubing, is that correct Ed?
In such a case, then the smooth copper tubing is in essence converted at the end to a male thread via an adapter, and a valve with a 1/2 inch FIP inlet can then screwed on to the adapter. You'd just want to put some teflon thread tape on there and then screw it on.
However, in this scenario someone has to sweat the adapter onto the smooth copper tubing. For folks who don't know what that means, it involves a blowtorch. This then, in my book, involves a professional.
I agree with Ed that it can be very easy to screw up attaching a shutoff valve to smooth copper tubing via a 1/2 inch NOM Comp inlet on the valve. But sweating on a threaded male adapter in my book means calling a professional. If you have a handyman that can sweat on the adapter at a reasonable cost, then I say go for it.
For me, if the copper tubing is smooth, I just use the 1/4 turn shutoff valves with the 1/2 inch NOM Comp inlet. I put these on myself so you can be darn sure I make certain those puppies are on there securely. I also use a little pipe dope in there as well before I crank it on which just helps me sleep better afterwards.
Bobby Gerry, Caroline Lending LLC
E-Mail: [email protected]