1-1/4" Impact Rain Gun – Full/Part Circle | 10–14mm Nozzle Set

RK-57 – 1-1/4" Impact Rain Gun for Commercial Field Irrigation

The RK-57 impact rain gun is engineered for commercial irrigation applications where consistent, wide-area coverage is essential. With a 1-1/4" female NPT inlet, interchangeable nozzles, and durable aluminum construction, this rain gun suits row crops, pastures, nurseries, and general field use. A minimum 2" supply line is required — DOES NOT WORK WITH GARDEN HOSE.

Key Features & Benefits

• Interchangeable nozzle set (10, 12, 14mm + 4mm auxiliary) — tune flow and radius to match your crop spacing and pump output without replacing the sprinkler head
• 28–82 GPM flow range — covers a broad range of pump capacities found on small-to-medium commercial operations
• 62.3–95.1 ft radius — wide throw reduces the number of head moves per irrigation cycle
• 30° trajectory — balances throw distance and wind resistance in open field conditions
• Full and part-circle operation — irrigate full fields or restrict arc for headlands and irregular plots
• Spring arm impact drive — proven mechanism with minimal maintenance, performs reliably at 30–70 PSI
• Jet breaker screw — breaks the water jet for more uniform distribution at the pattern edge
• Aluminum body and arm — lightweight yet corrosion-resistant for long service life in the field
• Brass nut, tube, and diffuser — wear-resistant components at critical connection and diffusion points
• Stainless steel spring and pin — resist corrosion and fatigue for consistent impact force over time
• 100 ft recommended spacing — plan your grid layout for uniform coverage across large blocks

Supply Line Requirement

This rain gun requires a 2" or larger supply line to deliver adequate flow and pressure. DOES NOT WORK WITH GARDEN HOSE.

Spare Parts Available:

• RK-57 Washer Replacemnt Kit : RK57-WASH
• RK-57 Diffuser Arm and Screw: RK57-DIFF
• RK-57 Secondary Diffuser Arm and Screw: RK57-DIFF2