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★ Works great for extending sprinkler pop up height through thick ground cover and other obstructions blocking the spray pattern to effectively water areas that need it ★ Stackable to get the height you need – please keep in mind that extensions do not retract into the original sprinkler casing | Easily installed without any tools ★ FITS: Rain Bird Pop Up Spray Heads: 1800 Spray, Uni-Sprays | Hunter Sprays: PRO-Spray, PS Spray, PS Ultra Sprays | Irritrol Sprays: I-PRO, SL Sprays | Weathermatic LX Sprays