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A device for restricting water flow through a conduit in a landscape sprinkler system, wherein the conduit comprises a hollow pipe having an interior wall, the device comprising a generally rigid disc having an external periphery shaped to conform to the interior wall of the conduit; attachment mean

A device for restricting water flow through a conduit in a landscape sprinkler system, wherein the conduit comprises a hollow pipe having an interior wall, the device comprising a generally rigid disc having an external periphery shaped to conform to the interior wall of the conduit; attachment means for frictionally securing the disc traverse to the interior wall of the conduit, and, at least one aperture in the disc to permit water flow therethrough, wherein the total area of any apertures in the disc are from about 1% to about 40% of the cross-sectional area of the disc.

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I claim: 1. A device for restricting water flow through a water conduit in a landscape sprinkler system, wherein the conduit comprises a hollow pipe having an interior wall, the device comprising: a generally rigid disc having a plurality of radial cuts around an external periphery shaped to confor

I claim: 1. A device for restricting water flow through a water conduit in a landscape sprinkler system, wherein the conduit comprises a hollow pipe having an interior wall, the device comprising: a generally rigid disc having a plurality of radial cuts around an external periphery shaped to conform to the interior wall of the conduit wherein said external periphery is operable to frictionally secure the disc transverse to the interior wall of the conduit, adjacent of said radial cuts defining segments of the rigid disc therebetween wherein a plurality of said defined segments, which generally abut one another, circumscribe the entire periphery of the rigid disc; and at least one aperture in the disc to permit water flow therethrough, wherein the total area of any apertures in the disc are from about 1% to about 40% of the cross-sectional area of the disc. 2. The device of claim 1 wherein the total area of any apertures in the disc are from about 2% to about 15% of the cross-sectional area of the disc. 3. The device of claim 1 wherein the total area of any apertures in the disc are from about 3% to about 8% of the cross-sectional area of the disc. 4. The device of claim 1 wherein the disc is dish shaped. 5. The device of claim 1 wherein the disc has at least one central aperture. 6. The device of claim 1 wherein the disc has a thickness of from about 0.007 inches to about 0.05 inches. 7. The device of claim 1 wherein the disc has a thickness of from about 0.01 inches to about 0.03 inches. 8. The device of claim 1 wherein the disc has a generally circular periphery. 9. The device of claim 1 wherein the disc is removably mounted to the interior wall of the conduit. 10. In combination, a water conduit for a landscape sprinkler system, said conduit comprising a hollow pipe member having an interior wall having a generally circular cross-section; and a flow-restricting device mounted across the interior cross-section of the conduit comprising a disc having a plurality of radial cuts around a peripheral edge portion frictionally secured to the interior wall of the conduit, adjacent of said radial cuts defining segments of the rigid disc therebetween wherein a plurality of said defined segments, which generally abut one another, circumscribe the entire periphery of the rigid disc, said disc having at least one aperture therethrough, the total of the cross sectional areas of any opening through the disc being from about 1% to about 40% of the cross-sectional area of the interior of the conduit. 11. The device of claim 10 wherein the total area of any apertures in the disc are from about 2% to about 15% of the cross-sectional area of the disc. 12. The device of claim 10 wherein the total area of any apertures in the disc are from about 3% to about 8% of the cross-sectional area of the disc. 13. The device of claim 10 wherein the disc is dish shaped. 14. The device of claim 10 wherein the disc has at least one central aperture. 15. The device of claim 10 wherein the disc has a thickness of from about 0.007 inches to about 0.05 inches. 16. The device of claim 10 wherein the disc has a thickness of from about 0.01 inches to about 0.03 inches. 17. The device of claim 10 wherein the disc has a generally circular periphery. 18. The device of claim 10 wherein the disc is removably mounted to the interior wall of the conduit. 19. A method of controlling flow through a conduit in a sprinkler system having at least one sprinkler head comprising: removably mounting a disc into an interior of the conduit upstream of the sprinkler head, said disc having a plurality of radial cuts around an external periphery and at least one aperture therethrough, adjacent of said radial cuts defining segments of the rigid disc therebetween wherein a plurality of said defined segments, which generally abut one another, circumscribe the entire periphery of the rigid disc, the total area of all apertures being from about 1% to about 40% of the cross-sectional area of the interior of the conduit. 20. The method of claim 19 wherein the total area of any apertures in the disc are from about 2% to about 15% of the cross-sectional area of the disc. 21. The method of claim 19 wherein the total area of any apertures in the disc are from about 3% to about 8% of the cross-sectional area of the disc. 22. The method of claim 19 wherein the disc is dish shaped. 23. The method of claim 19 wherein the disc has at least one central aperture. 24. The method of claim 19 wherein the disc has a thickness of from about 0.007 inches to about 0.05 inches. 25. The method of claim 19 wherein the disc has a thickness of from about 0.01 inches to about 0.03 inches. 26. The method of claim 19 wherein the disc has a generally circular periphery. 27. The method of claim 19 wherein the disc is removably mounted to the interior wall of the conduit.