Best way to connect a friction fit pipe with a threaded one?

[S1ngram]

As my title states, I need to find the best way to connect a shut off valve to my return. This is my current set up. My return is also my pool light. In the near future, I will be installing a Saltwater Chlorine Generator between the filter and the new shut off valve (if that makes a difference).

 

[Donny]

You mean something like this one ?? http://www.grainger.com/product/GF-PIPING-SYSTEMS-Male-Adapter-6MV39?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/6MV35_AS01?$smthumb$

or this one:

http://www.ebay.com/itm/Pvc-Adaptor...803?pt=LH_DefaultDomain_0&hash=item2ed089da13

 

[JasonLion]

The simplest thing to do is to add a new short piece of hose and put in a ball valve with two barbed fittings attached.

 

[S1ngram]

I called my pool store and learned that there is not a fitting like that made. I will have to be creative I suppose.

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Thanks Jason Lion, I figured that is what I'd have to do.

 

[NewPoolYork]

I can't say my way is great, but with that same light I have my valve in the other side of the your pictured soft pvc near the filter. I am using a Hayward SP0723 off the filter return. (Going from memory, just had my pool installed less than a week ago.).

 

[S1ngram]

I just ordered and received a Pentair hard plumbing adapter for my Aqualuminator light! So, this is what I have come up with. It probably isn't the cheapest solution, but it's what I was able to piece together with limited experience with PVC

The adapter and another part have to be glued. Did I pick the right glue? Should I be using different parts to connect the shut off and adapter or is this OK? The adapter is the part on the right in the photo

 

[NewPoolYork]

Please post the results. I am looking to do the same.
I have not done much PVC work but I used Oatey 30246 PVC Regular Cement and 4-Ounce NSF Purple Primer Handy Pack (search Amazon) in the past. Hopefully someone more skilled will chime in.