thermostatic shower mixing valve

We have thermo valves in our home showers, and really wanted one for the GMC. Unfortunately, most are too big and too expensive to be practical. After much searching, I found this thermo valve and quarter turn shut-off valve from HydraWand: http://hydrawand.com/product/thermostatic-valve-kit

These are intended for a bidet retrofitted under a regular house sink cabinet. The seller was REALLY helpful and happy to just sell the parts we needed instead of the whole kit. We got the thermo valve and shut off valve, and plumbed the rest with PEX fittings. One note: the stuff that looks like 1/2 inch male pipe threads on the thermo valve will not work with sharkbite female pipe (FIP) fittings. You have to use sink valve fittings like are on the end of those braided stainless hoses; readily available for PEX, you just have to know what to look for. The SharkBite package says "1/2 x 1/2 FNPT Straight Connector (Swivel)". The non-swivel versions would not thread properly onto the valve fittings. I notched the stainless mounting bracket that came with the thermo valve so it would fit more snugly against the corner of the fiberglass, but that may not be necessary depending on where/how you decide to mount it. We mounted the thermo valve in the wall recess of the shower, pointing downward through a hole in the fiberglass, which makes it easy to access. (see bottom of picture) It is mounted at about a 45 degree angle to the front of the shower wall so you can easily see the markings. The shutoff valve fit perfectly in the existing hole where the sprayer hose fitting was. We cut a rubber washer to go between the shutoff valve and the fiberglass. In back is a big washer and a nut. Works amazing well even at very low water flow rates with the shutoff valve barely open, and we're really happy with the upgrade. No more futzing with the faucet to get the temperature right for a shower, and no more hot/cold surprises. We were able to replace the sink faucet with a regular old house faucet -- no more need for the special obsolete diverter faucet.