These additional sprinklers allow you to expand your Snip-n-Spray Garden and Landscape Sprinkler System, up to a maximum of five sprinklers per sprinkler system. Performs best on water systems with 50 to 65 PSI of water pressure. When setting up the sprinkler system with five sprinklers, use the Y-Connector, included in the Snip-N-Spray Garden & Landscape Sprinkler System, to make the system into the loop pattern described in the instructions, and set each sprinkler's spray arc to 50 degrees or less.