Maximize your watering! Wobbler heads provide extremely uniform coverage, even at lower pressures. Unique off-center rotary action is counterbalanced to be smooth and stable. Very low evaporative loss. Engineering-grade thermoplastic with no metal parts for corrosion resistance. NPT male connections. Operating pressure: 20 to 35 psi 1/2in. male pipe threads. Nozzle opening is 3/32in. Spray diameter from 30.8ft. at 1.1 gpm to 32ft. at 1.47 gpm.