The Hunter I-20 Standard Pop-Up is a great solution for any surface-irrigated Har-Tru clay court. This model has a pop-up rotor sprinkler featuring full arc or adjustable arc and can be used with or without a check valve. The Hunter I-20 Standard Pop-Up commercial grade sprinkler will out-perform traditional impact sprinkler heads. Recent improvements include automatic arc return; non-reversing 360, from 50 to 360 degrees; and a non-strippable, vandal-proof drive mechanism that prevents gear stripping and saves repair costs. This rotor is also backed with a 5 year warranty.