Hunter PGP-ATR Rotors This is a replacement rotor used ONLY to replace Impact Sprinklers housed in impact canisters such as Rain Bird's Maxi-Paw rotors. Hunter's PGP-ATR is the easy way to upgrade existing impact canister heads to modern gear drive technology. Now you can say goodbye to your inferior method of irrigation and say hello to the superior quality of the PGP rotor. No digging or lawn disruption, in a matter of minutes, you can repair an existing head or upgrade an entire outdated system to gear drive rotors.
