You are refering to hydrant valves. They are available in various burial depths. Around here you can get then for 18", 24" and 36" burial depths. They aren't cheap - typically around $35-$40 each. Home Depot carries them as will your local farm supply stores or plumbing stores. If you watch, once or twice a year they come on sale and you can get a deal (~$25). Last year, we rented a ditchwitch to dig a bunch of of 24" deep trenches, buried around 1000 feet of pipe and installed 15 hydrant valves. We used hydrant valves because we can leave the outside water on year around without fear of freezing. Just remember that hydrant valves must be all on or all off. If you try to adjust flow with them, they will leak a stream of water from the "drain" hole. We lost gallons of water before we figured this out. With respect to pipe, we used both PVC and black poly. Beware of black poly as it comes in a number of different weights. We used the 200 PSI stuff which has pretty thick walls. In areas where squirrels and other burrowing creatures are a problem, we used PVC. Conventional wisdom in this area is that these creatures will attack black poly, but tend to leave PVC alone. So far, we have not had a problem. Another suggestion is to bury 110 wire with your pipe. We did this and put an outlet on every hydrant valve. Be sure to usee GFCI outlets. We useda length of gray PCV pipe into a plastic outside box. We fastened this to the back side of teh hydrant valve in three places with regular hose clamps. It is really nice to have power for teh weed whacker or for other power tools scattered through the yard. The burial wire was pretty cheap and its installation in an exitsting trench took very little extra time. Cost for each outlet was about $15 for the pipe, box, cover and 20amp GFCI outlet. Good luck on your project.
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