Cooper Pegler CP15 Classic 15 Litre Knapsack Pesticide Sprayer

The Cooper Pegler CP15 Classic is a 15 litre knapsack sprayer built for daily professional use. It needs little maintenance, handles the toughest professional chemicals without complaint, and keeps performing accurately year after year. Spindrift, the UK distributor, still services CP15 Classic sprayers over 50 years old. That comes down to a diaphragm pump with no moving parts exposed to friction, brass components throughout, and a build that has never chased the lowest price.

For amenity contractors, groundskeepers, landscape professionals and serious gardeners, the CP15 Classic is a reliable choice. It is not the cheapest knapsack sprayer on the market, but it is often the one still in use a decade later.

A pump with no friction to wear out

The heart of the CP15 Classic is its diaphragm pump. Pressure builds through the controlled flexing of a diaphragm rather than direct contact between moving parts, so friction is largely eliminated from the mechanism. This helps the pump resist the fine particles and sediment that quickly wear out conventional piston pumps in the field. Brass components throughout add further durability and chemical resistance, so the pump keeps performing accurately well after cheaper alternatives have given up.

Key features

Dual pressure control valve (1 bar and 3 bar settings)

The integrated pressure control valve gives two fixed working pressures. The 1 bar setting suits low-pressure applications such as fungicides and insecticides, where fine, even droplet distribution matters. The 3 bar setting delivers the higher pressure that herbicide application needs, for a consistent flat fan pattern across the target area. A dedicated switching tool is supplied as standard, so changing settings in the field takes seconds. For professional operators this precision matters: accurate, repeatable application rates are a regulatory requirement under UK pesticide legislation.

The trigger assembly

The Cooper Pegler trigger assembly fits every lance tube and accessory across the Cooper Pegler range, so it stays useful if you add kit later. The ergonomic composite handle reduces hand fatigue during long spraying sessions, and the lock-on feature allows continuous spraying without holding the trigger, which is useful when covering large areas. A filter built into the trigger assembly gives extra protection against blockages close to the nozzle.

Double filtration

Blockages cost time and disrupt spray quality. The CP15 Classic uses a two-stage filter: a coarse strainer in the filler neck removes debris when filling, and a second filter in the trigger assembly catches anything that gets through before it reaches the nozzle. Fewer blockages mean fewer interruptions through the working day.

The 15 litre UV-stabilised tank

The transparent tank is rated at 15 litres, with an actual capacity of 17 litres. Cooper Pegler makes it from UV-stabilised polypropylene, which is lightweight, chemically resistant and tough enough for daily outdoor use. The translucent tank also lets you check liquid levels at a glance without removing the lid. The wide 140mm filler neck makes refilling quicker and cleaner, reducing the risk of splashing, and a lid with a dedicated seal and integrated air vent stops both leakage and vacuum forming as the tank empties, so pump performance stays smooth from a full tank down to the last litre.

Fibreglass-reinforced lance

The 500mm lance is made from glass-reinforced plastic, giving the rigidity of a metal lance without the weight or corrosion risk. GRP also resists the chemicals used in most professional spraying work. Brass hose fittings connect the lance to a reinforced high-pressure hose, for a spray line built to handle years of daily use.

Left or right-hand operation

The reinforced pumping lever adjusts for left or right-hand operation without tools, so any operator can set up the sprayer in seconds. That matters on busy contracting sites where equipment is shared between operators through the day.

Rapid-fit shoulder harness

The harness uses polyethylene shoulder pads with polyester fibre braiding, a practical, hardwearing carrying system for daily professional use. The quick-release fitting lets you put the sprayer on and take it off quickly when moving between treatment areas or in and out of a vehicle.

Full specifications

What’s in the box

• Cooper Pegler CP15 Classic 15L knapsack sprayer
• Green anvil nozzle (AN1.2) for herbicide application
• Yellow hollow cone nozzle (HCX-02) for fungicide and insecticide application
• Pressure setting tool

Accessories and compatibility

The CP15 Classic works with the full Cooper Pegler accessories range. Lances, nozzles, booms and fittings are also compatible with the Series 2000 and Evolution families, so contractors running mixed fleets only need one set of spares. Useful accessories for the CP15 include:

• Extended telescopic lance tubes for increased reach when treating taller vegetation
• Multi-nozzle spray booms (2, 3 and 4 nozzle configurations) for wider application widths
• Spray shields for targeted spot treatment with reduced drift risk
• Flat fan, deflector and adjustable nozzle options for different applications
• Replacement diaphragms, seals and full service kits

Ideal applications

The CP15 Classic suits any professional or domestic operator who needs a reliable, accurate 15 litre knapsack for regular spraying work, including:

• Herbicide application on paths, driveways, car parks and hard surfaces
• Weed control in amenity planting schemes and landscape contracts
• Fungicide and insecticide treatment on ornamental plants, shrubs and trees
• Grounds maintenance on sports pitches, golf courses and public open spaces
• Estate and farm management
• Local authority and highways weed control operations
• Garden use for homeowners with larger plots or formal gardens

A note on professional pesticide use

Anyone applying pesticides in a professional or commercial capacity in the UK must hold a PA1/PA6 certificate of competence or an equivalent qualification. The CP15 Classic is designed and manufactured in compliance with European safety standards for professional spraying equipment. Regular calibration and maintenance in line with National Sprayer Testing Scheme (NSTS) guidelines will help keep application accurate and compliant throughout the sprayer’s working life.

Cooper Pegler heritage

Cooper Pegler has been manufacturing professional spraying equipment for over 100 years. The CP15 Classic traces its design lineage to the original knapsack developed with ICI Plant Protection in the 1960s. Like all Cooper Pegler products, it is built at the EXEL Industries factory in France to European standards, and spare parts are guaranteed for at least ten years after a product is discontinued. For contractors who want a 15 litre knapsack sprayer that stands up to daily use, takes the full accessory range and stays serviceable a decade from now, that level of parts support and build quality is unusual at this price.

Not sure the CP15 is right for you? If you need a larger 20 litre tank for covering bigger areas, take a look at the Cooper Pegler CP3 Classic. If you are looking at the Berthoud range, the Berthoud Cosmos 18 Pro offers 6 bar pressure and a built-in mixer at a good price point, while the Berthoud Vermorel 1800 is our most ergonomic option for operators who spray for extended periods.

Need advice on nozzle selection, accessories or whether the CP15 or CP3 suits your operation better? Contact the Phoenix Amenity Supplies team. We work with professional spraying equipment every day and are happy to help.