RK2120NL 5.5 GPM 2900 PSI | solid shaft Triplex Pump

RK2120NL — 5.5 GPM, 2900 PSI Triplex Pump, 1450 RPM, Solid Shaft (45 mm)

Overview

The Annovi Reverberi RK2120NL triplex plunger pump is a powerful, high-efficiency pressure washer pump engineered for users who require dependable performance, smooth operation, and long service life. Delivering 5.5 gallons per minute at 2900 PSI, this pump offers an excellent balance of water volume and cleaning pressure, making it well suited for residential, commercial, and light industrial cleaning applications. Its solid shaft configuration with a 24 mm diameter and 45 mm length provides added versatility for belt-driven and gearbox-driven systems where direct coupling is required.

Operating at a low-speed 1450 RPM, the RK2120NL is designed to minimize wear, heat, and vibration while maintaining consistent output. This slower operating speed significantly extends the life of internal components such as seals, bearings, and valves, resulting in fewer maintenance intervals and reduced downtime. Built on Annovi Reverberi’s proven RK-series platform, the RK2120NL is trusted by professionals who demand reliable performance under frequent or extended use.

With an impressive Effective Cleaning Unit (ECU) rating of 16,450, the RK2120NL delivers excellent real-world cleaning efficiency. The combination of high flow and strong pressure allows operators to clean large surface areas quickly while still providing the impact force necessary to remove stubborn dirt, grease, and buildup. This balance makes the pump a versatile solution across a wide range of cleaning environments.

Performance & Cleaning Efficiency

The RK2120NL’s 5.5 GPM flow rate is ideal for applications where water volume plays a critical role in productivity. Higher flow improves rinsing speed, detergent application, and debris removal, reducing overall cleaning time. Paired with 2900 PSI, the pump delivers enough pressure to handle tougher cleaning tasks without being overly aggressive on more delicate surfaces.

This performance profile makes the RK2120NL an excellent choice for contractors, property maintenance professionals, and homeowners who need a pump capable of handling both routine cleaning and more demanding jobs. The high ECU rating reflects its ability to provide consistent, efficient cleaning results across a wide variety of applications.

Triplex Plunger Technology

At the core of the RK2120NL is a triplex plunger pump design, widely regarded as the gold standard for durability and efficiency in pressure washing systems. The pump uses three ceramic plungers driven by a precision-balanced crankshaft to produce smooth, continuous water flow with minimal pressure pulsation.

Compared to axial cam pumps, triplex pumps offer superior longevity, improved efficiency, and better performance during extended run times. Reduced pulsation helps protect hoses, fittings, unloaders, and spray guns, improving overall system reliability and reducing long-term maintenance costs.

Solid Shaft Design & Drive Compatibility

The RK2120NL features a solid crankshaft with a 24 mm diameter and 45 mm length, making it ideal for belt-driven, gearbox-driven, and custom power transmission setups. This shaft configuration provides excellent strength and stability, ensuring smooth torque transfer and consistent operation even under demanding load conditions.

The solid shaft design offers flexibility for a wide range of engine and motor configurations, making the RK2120NL a preferred option for system builders and equipment manufacturers who require adaptable mounting and drive options.

Construction & Durability

Built with premium materials and precision machining, the RK2120NL is designed to withstand the demands of daily use. Ceramic plungers provide exceptional hardness and resistance to abrasion and heat, ensuring long-lasting sealing performance. High-quality internal components are engineered to handle sustained pressure and flow while maintaining smooth, efficient operation.

This rugged construction makes the pump suitable for residential users, commercial cleaning professionals, and light industrial environments where reliability and durability are critical. By minimizing wear and maintaining consistent output, the RK2120NL helps ensure dependable performance over the long term.

Low-Speed Operation & Longevity

Operating at 1450 RPM, the RK2120NL runs significantly slower than many standard pressure washer pumps. This low-speed operation reduces stress on critical components, lowers operating temperatures, and minimizes vibration. The result is quieter operation, extended service life, and improved overall system stability.

For users who rely on their equipment regularly, these benefits translate into fewer repairs, longer maintenance intervals, and a lower total cost of ownership.

Installation & Maintenance

The RK2120NL is designed for easy installation and straightforward maintenance. The pump ships factory pre-filled with pump oil, allowing for quick startup after installation. An integrated oil sight glass provides a convenient way to visually monitor oil levels, helping maintain proper lubrication at all times.

A vented dipstick supports proper crankcase ventilation and simplifies routine oil checks and changes. These user-friendly maintenance features make the pump accessible for both professional technicians and end users, ensuring peak performance with minimal effort.

Key Specifications

• Model: RK2120NL
• Pump Type: Triplex Plunger Pump
• Flow Rate: 5.5 GPM
• Maximum Pressure: 2900 PSI
• Operating Speed: 1450 RPM
• Effective Cleaning Units (ECU): 16,450
• Crankshaft: 24 mm diameter x 45 mm length (solid shaft)
• Application Range: Residential, Commercial, Light Industrial
• Warranty: 5-Year Manufacturer Coverage

What’s Included

• Factory pre-filled pump oil
• Oil sight glass for easy monitoring
• Vented dipstick for proper lubrication and cooling
• Operation manual and detailed parts breakdown
• 5-year manufacturer warranty
• Access to nationwide Annovi Reverberi service centers

Typical Use Cases

• Residential cleaning: driveways, patios, decks, siding, fences
• Vehicle washing: cars, RVs, boats, motorcycles
• Commercial cleaning and contractor applications
• Fleet and equipment maintenance
• Large outdoor surface and property cleaning

Why Choose the RK2120NL

The RK2120NL delivers professional-grade cleaning performance with an ideal balance of flow, pressure, and efficiency. Its solid shaft design provides flexibility for a wide range of drive configurations, while the triplex plunger system ensures smooth, reliable operation. Ceramic plungers and premium internal components enhance durability, making the pump well suited for demanding environments.

Backed by Annovi Reverberi’s extensive service network and a 5-year manufacturer warranty, the RK2120NL offers long-term value, reliability, and peace of mind for users who demand consistent, high-quality performance.

Final Thoughts

With a powerful output of 5.5 GPM at 2900 PSI and an ECU rating of 16,450, the Annovi Reverberi RK2120NL triplex pump delivers exceptional cleaning efficiency and dependable performance. Its low-speed 1450 RPM operation, solid shaft configuration, and durable construction make it an excellent choice for residential, commercial, and light industrial pressure washing systems where reliability and versatility are essential.