Ximimark 2Pcs 1/2" Thread Plastic Electric Solenoid Valve Water Inlet Flow Switch Magnetic Water Air Normally Closed Tools DC 12V N/C 0.02 to 0.8mpa

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These worked great to fix a pedicure chair

First, these are priced right, but I wouldn't expect the plastic valve body to last as long as a Brass valve body. I did a lot of research to check the thread specs and these are 1/2 inch, but they are British (International) 1/2 inch and not NPT (US Standard). Similar, but a different thread pitch and profile, so yiu COULD force an NPT fitting on these plastic threads, but it will ruin the threads and will likely leak. You need a 1/2 inch adapter - 1/2 NPS Female - for the input (the side with the power terminals) and the same - 1/2 NPS Female - for the outlet side. NPS fittings requires a Rubber sealing washer, much like your garden hose does because the threads DON'T seal, like NPT does. MY PROJECT: I'm using these in a custom-made three-zone hot water recirc system, and I'm using 1/2 inch PEX for my return (recycle) lines. So I bought 1/2 inch Female NPS to 1/2 inch NPT Male adapters, and 1/2 inch NPT to 1/2 Inch PEX adapters. So the overall length - with adapters - is 8 inches! With these adapters included, the cost per Valve - the REAL COST - is over $25 per valve. So it's going to take awhile to recover the cost (from not wasting 4 gallons of water waiting for actual Hot water). MOUNTING: The four mounting posts under the valve have small unthreaded holes, so I suggest you pre-drill them to accept your own screws. The mounting posts are accurately Square, with post center to center at exactly 25 mm. That's just a smidge (2/125) under an inch. One inch will work, though. I'm going to buy some spare Solenoid Valves for if (when) these fail. I'll be looking for Brass ones now.

I bought this pair to hook up to an ESP32, to run the drip misters on my ferns and roses. Managed to get them running on the same PSU. Wired in a flyback resister and they're perfect. Honestly I have treated them like total crap - I just 3D printed a little cap to keep the connectors covered, and left them exposed to the elements - and they're still going strong, cycling several times per day, 3 Southern summers later. Lots of misunderstandings among the reviews here, people are not reading the specs fully. You do need a minimum pressure for it to work, I use ~25psi and it's fine. Also the solenoid is cooled by the water flowing through - if you run it dry, you will burn it out quickly. I'm writing this because I came back to but a few more pairs, create a few mini-manifolds around my yard.

I use them for my greenhouse and converted a sprinkler controller to 12v dc for their operation. Don’t forget the diode block!!! These only hold pressure in the forward direction so back flowing will allow slippage. Will post a YouTube (under the valve name) on installing soon.