Udor Kappa 55 Diaphragm Pump Only
Quick Overview
- High Performance: Delivers up to 15 GPM and 560 PSI for demanding spraying and fluid transfer tasks.
- Durable Build: Features anodized aluminum construction with stainless steel internal components and urethane diaphragms.
- Ideal for industrial cleaning applications
- Engine Compatibility: Available with gearboxes for 5–11 HP gas engines or a thru-shaft version for universal mounting.
- Low Maintenance: Self-priming, dry-run capable, and supported by readily available repair kits and replacement parts.
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$1,874.80
$2,149.15
Udor Kappa 55 Medium Pressure Diaphragm Pump
Powerful, Reliable, and Versatile Spraying Pump for Demanding Applications
The Udor Kappa 55 is a high-performance, 3-cylinder medium-pressure diaphragm pump designed for durability and versatility across a wide range of spraying and fluid-handling applications. Featuring internally manifolded anodized aluminum construction, stainless steel liquid handling components, and urethane diaphragms, the Kappa 55 delivers dependable performance under tough conditions.
Perfectly suited for horticultural and agricultural spraying, lawn and turf care, pest control, nursery use, de-icing, hydrostatic testing, washdown, and more, this self-priming, dry-run capable pump handles even the most challenging fluids—from fertilizers and pesticides to abrasive suspension products.
Key Features:
- Max Flow: 15 GPM (57 L/min)
- Max Pressure: 560 PSI (38.6 bar)
- Max Pump Speed: 550 RPM
- Max Fluid Temperature: 140°F (60°C)
- Construction: Anodized aluminum body with stainless steel check valves and diaphragm bolts
- Design: 3-diaphragm, positive displacement pump with pulsation dampener
- Self-Priming & Dry-Run Capable


Shown mounted on a batch spraying skid
Port Sizes:
-Inlet: 1-1/4" Hose Barb
-Outlet (x2): 1/2" Hose Barb
-Bypass: 3/4" Hose Barb
Dimensions & Weight:
Dimensions: 11.5" L x 12.5" W x 10" H
Weight: 37–47 lbs (model dependent)
Maintenance & Accessories:
Lubrication: 23 oz. of Udor Lube 40W or 30W/15W-40 non-detergent oil
Why Choose the Kappa 55?
Whether you're spraying large fields, maintaining landscapes, or tackling industrial cleaning and testing, the Udor Kappa 55 delivers robust performance, minimal maintenance, and long-lasting durability—all in a compact, versatile package.

Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm. These chemicals can be in the products that Californians purchase, in their homes or workplaces, or that are released into the environment. By requiring that this information be provided, Proposition 65 enables Californians to make informed decisions about their exposures to these chemicals. Proposition 65 also prohibits California businesses from knowingly discharging significant amounts of listed chemicals into sources of drinking water. Proposition 65 requires California to publish a list of chemicals known to cause cancer, birth defects or other reproductive harm. This list, which must be updated at least once a year, has grown to include approximately 900 chemicals since it was first published in 1987. Proposition 65 became law in November 1986, when California voters approved it by a 63-37 percent margin. The official name of Proposition 65 is the Safe Drinking Water and Toxic Enforcement Act of 1986.
The list of chemicals contains a wide range of naturally occurring and synthetic chemicals that include additives or ingredients in pesticides, common household products, food, drugs, dyes, or solvents. Listed chemicals may also be used in manufacturing and construction, or they may be byproducts of chemical processes, such as motor vehicle exhaust. For more information visit www.p65warnings.ca.gov/