With respect: Water in a pipe going straight up has pressure dependent only on the height of the column, not the amount of water in the column. If so a city water tank would have dramatic pressure from the big overhead tank. A 1/4" tube will have the same static head of pressure on it as a 6" pipe, assuming the same vertical change. Putting only one check valve into a well stem (at the bottom) does all the reverse flow needed. There is no change in head from a check. Multiple check valves would do nothing but restrict the flow. Jim
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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