RK-55 Brass Impact Sprinkler – 1-1/4" MNPT Part Circle 23°

RK-55 – 1-1/4" MNPT Part Circle Brass Impact Sprinkler (23°)

The RK-55 is a 1-1/4" MNPT part-circle brass impact sprinkler with dual 13/32" x 7/32" nozzles, a flow range of 36.7–114.2 GPM, and a radius of 73.8–106 ft at 50–85 PSI. It is the highest-output sprinkler in the RK brass impact line, intended exclusively for large commercial agricultural irrigation systems — extensive pasture blocks, large farm fields, and high-volume orchard layouts.

DOES NOT WORK WITH A GARDEN HOSE. This sprinkler requires a commercial-grade irrigation supply with 1-1/4" MNPT threaded connection and system pressure of 50–85 PSI with sufficient flow to meet the stated range.

Key Features and Benefits

• 1-1/4" MNPT connection — large-bore supply fitting for the highest flow rates in commercial irrigation systems.
• Extreme flow capacity (36.7–114.2 GPM) — covers large blocks quickly with fewer risers, reducing system installation cost per acre.
• 73.8–106 ft radius — the widest throw in the RK brass impact range, enabling wide riser spacings on large agricultural properties.
• Adjustable part-circle arc — limits coverage to the irrigated zone at field boundaries, roads, and structures.
• Dual nozzle set (13/32" x 7/32") — select flow rate to match system hydraulic requirements.
• Bronze body and arm — heavy construction for continuous high-volume commercial service.
• Brass nut and tube — precise nozzle alignment maintained under high flow and pressure conditions.
• Stainless steel spring and pin — corrosion-resistant impact drive rated for demanding high-pressure cycles.

Construction

Bronze body and arm, brass nut and tube, stainless steel spring and pin. Spring arm impact drive.