Motorized Ball Valve- 1/2" Brass Ball Valve with Full Port, 9-24V AC/DC and 2 Wire Auto Return Setup by U.S. Solid

Pricey but solid. they work solid and do make the zippy noise. These are not INSTANT. They take a couple of seconds to open or close. Great for RV tanks as you can barely hear them work. I haven't had one malfunction yet with gray water or debris. I got them on multiple tanks under the RV for almost a year, no problems (I do spray silicon lubricant into each valve every 6 month to avoid salt water corrosion). These don't overheat when left ON ( I leave them open all night when the temp drops below freezing) to empty the tanks and avoid ice damage.

I used this to control the water for an automatic evaporative cooler setup. It worked perfectly all summer exposed to full sun in 115°+ weather. It did not see much rain so I cannot confirm its water resistance.

Having trouble with undependable swing gate valves? So was I on my RV heating system! Installed this motorized unit and eliminated occasional cold blowing heating ducts! Very simple installation. As soon as system fans engage this unit opens and we have HEAT! No gate valve partially open or not! This units ball valve totally opens or shuts and allows a FULL FLOW of fluid.

Update 9/19/2021 Chinese companies often make up names that are supposed to be American sounding to appeal to the American buyer, and sometimes they get it so wrong it is comical. "US Solid" is as blatant as you could get. Would a real US company name itself "US Solid"? Seeing how much the price has gone up on these, I unscrewed my non-functioning US Solid Motorized Ball Valve to see if I could fix it. If you "Roll over to zoom..." the 5th image, the one of the green circuit board inside, you can read 'CWX15-CR04' printed on it. I searched for CWX15-CR04 to see if I could find anyone selling a replacement circuit board and that led me to find out there is a real company name Tianjin Tianfei High-Tech Valve Co., Ltd. that makes these and sells them directly with their own "CWX" brand name., and they sell them quite a lot cheaper, if you don't count the shipping cost. I wonder if "US Solid" has any connection to the real company that makes these. I've also found them rebranded under other brand names. As for "solid", when I unscrewed it I noticed the external screws were rusty. How much would it cost them to use stainless steel screws? And the screws inside were also slightly rusty, so moisture had gotten through the whimpy looking case gasket. After I poked around with my meter probes the the dead circuit board came back to life. I'm guessing some internal, bad connection got jiggled, since there was nothing more I did to fix it.. So I upgraded my review from 2 stars to 3 because at least now it is working again. My original review, 8/15/2018: The standard diaphragm solenoid valves used in sprinkler systems cause significant pressure drop and are also unreliable. A motorized ball valve has no pressure loss which means I can put more sprinklers in a zone. This one makes an easy replacement because it returns to closed when power is removed, like a solenoid valve, and unlike most motorized valves and it can take a wide range of voltages, ac or dc, making it an easy drop-in replacement. Update 6/22/2021: I bought a second one and it failed after two years of light use. My sprinkler system only operates for a couple of months during summer and then only a couple of times a week, so the valve would have had less than 100 cycles. The advertisement says "The estimated life expectancy of 80,000 to 100,000 cycles means it is built to last". I am downgrading my review to 2 stars

I've used other brands and types of electric valves, both - 110v-or-24v for the air valve on my compressor and this one is the best. It opens and closes smoothly .The extra bonus is that it does not create heat when it's opened or closed. It's a great valve and I will definitely buy this type in the future.