Aquifers™ water evenly, deeply, and quickly. They are also very low maintenance and can be kept in place year round. Guaranteed against breakage for Five Years with Neversink HQ. Stand should be connected with pp poly pipe. Stand includes the wobbler sprinkler head and stainless steel ground stake. Stand can also be chained with mainline poly to Neversink Aquifer Field Kits. Wobbler Wobblers are the best sprinkler head available as they operate well in a large pressure range and water evenly every time with an adequate water source.Each sprinkler head (Senniger Xcel Wobbler with a gray #9 9/64" nozzle) specifications are as follows;Pressure - Flow (gpm) - Diameter at 1.5 ft10 psi - 1.815 - 4415 psi - 2.2 - 4720 psi - 2.54 - 50.525 psi - 2.84 - 52.5 Max Pressure is 85 psi through flow and spray diameter will cap at 2.8 gpm and 52 ft for each wobbler.