Thermostatic Mixing Valve，Shower Mixing Valve with 1/2 NPT Male Connections,Water Temperature Constant Control Valve,Solid Brass

Incorrect product description. Threads are straight (NPS), not tapered (NPT). Product leaks when connected to an NPT fitting.UPDATE: Had another go and cranked the 1/2 fittings on for all I was worth--no leaks. Device works perfectly for my application, prevent toilet sweating. Like that the temperature can be set down to ~68 F, some others cannot go that low.

I put this on my kids shower so they can't scald themselves. Temperature response is excellent. I like it so much i just bought a second one for my shower.One tip: throw the included Teflon tape away. If you use it, it will leak. Buy some good Teflon tape and you'll be fine.

Not sure why, but this has 1/2" hose threaded connections. It isn't 1/2" pipe thread on the body of the valve. There are three adapters included to convert from 1/2" hose to 1/2" pipe, which I used. The hose washers are soft too, so when tightening up the connections to hold the valve in place, the washers got compressed too much and leaked. I put on new washers, didn't tighten up the connections as much, but then the unit moves around rather easily when adjusting the temperature. I would have preferred it was the other way around, that is to say, 1/2" NPT on the body of the valve, and then adapters to 1/2" hose threads (which I wouldn't need to use). The quality of the unit is top notch, does a great job tempering the temperature to what I want, but it's these hose threads made little sense to me.

NPT and NPS have the same thread angle, shape, and pitch (threads per inch). However, NPT threads are tapered and NPS threads are straight. Don't buy the NPS Thermostatic Mixing Valve unless you need straight threads, If you need NPT tapered no washer needed only thread seal buy the valve with NPT and no need to use the leaking fittings to change from NPS to NPT as almost all of the one star reviews did. Also a one star pointed out no directions come with valve for installation, the C on valve is for Cold water the H is for Hot water and the arrow is for warm mixed water out to fixture, and the red button lets you go over 100 degree water supply to fixture. The pointer is to set water temperature by turning the valve to the temperature you want. I put NPT to PEX fittings using tape on the NPT turned on the hot and cold water no drips worked great. set valve to 86 degrees, has a full flow and works great. I never tested to see if cold water fails if valve shuts down and I don't know if it fails to cold so I would not use it for anyone with any impairment that may scald them unless I checked that out first?

Works great and was easy to install