What do the color codes and degree ratings on pressure washer nozzles mean?
Pressure washer nozzles are color-coded by spray angle. Red (0°) produces a pencil-thin stream with maximum impact - useful for very tough soils but can damage soft surfaces. Yellow (15°) is a tight fan for heavy-duty cleaning. Green (25°) is the most common all-purpose angle. White (40°) is a wide, gentle fan suitable for rinsing and delicate surfaces. Black (65°) is used for low-pressure chemical application (soap) only. Always start with a wider nozzle and work narrower as needed - never start with a 0° nozzle on an unknown surface.
How do I choose the correct nozzle size for my machine?
Nozzle orifice size must be matched to your machine's GPM output and target operating pressure. Using an orifice that is too small over-pressurizes the system and stresses the pump; too large and pressure drops below operating spec. Nozzle sizing charts - available from Alkota and nozzle manufacturers - let you cross-reference your pump's GPM against your desired PSI to find the correct orifice size. A properly sized nozzle will produce your machine's rated pressure. When in doubt, consult Alkota with your machine's specs.
When should I use a rotating (turbo) nozzle?
A rotating nozzle - also called a turbo nozzle - spins a 0° pencil stream in a rapid circular pattern using the force of water flow. This gives you the concentrated impact of a 0° stream with the area coverage of a wider nozzle, making it significantly faster on heavily soiled surfaces like concrete, brick, and heavily scaled equipment. Turbo nozzles are not suitable for soft, delicate, or easily damaged surfaces. They are one of the most effective productivity tools for commercial cleaning operators.
What are the SAE 100R1 and 100R2 hose ratings?
SAE 100R1 and 100R2 are Society of Automotive Engineers ratings for hydraulic hose. R1 indicates a single-wire braid reinforcement layer; R2 has two wire braid layers and is rated for higher pressures. Both ratings specify the hose's burst and operating pressure limits. The standard safety factor for hydraulic hose is 4:1 - meaning you should use hose with a burst pressure at least four times your system's operating pressure. Never use garden hose or other non-rated hose on the high-pressure side of a pressure washer.
What is a hose guard (bend restrictor) and do I need one?
A hose guard is a spring or rubber sleeve fitted at the ends of a high-pressure hose where it connects to the machine and gun. The guard prevents the hose from being bent sharply right at the fitting - a common cause of hose failure, since repeated sharp bending at fittings fatigues the wire braid and inner tube. Hose guards should be standard on any commercial hose assembly and should be replaced if cracked or missing.
What should I inspect on my high-pressure hose before each use?
Before each use, inspect the entire length of hose for: cuts or abrasion in the outer cover, kinking, bulging (a bulge indicates the wire braid has failed - replace immediately), damage at fittings, and signs of leaking or weeping. Check quick-connect fittings at both ends for proper engagement and any signs of wear. A hose that shows a bulge should never be used - the inner tube is at risk of failure under pressure, which can cause serious injury.
What are quick-connect (quick-disconnect) fittings?
Quick-connect fittings allow rapid attachment and detachment of hoses, guns, and accessories without tools. They create a secure, pressure-tight connection and automatically close when disconnected to prevent flow. Quality quick-connects rated for your system's pressure are essential - cheap or worn fittings can fail to seal, leak under pressure, or separate while pressurized, creating a dangerous whipping hose situation. Always use fittings rated above your system's operating pressure and replace any that don't engage firmly or show signs of wear.
What is a surface cleaner and when should I use one?
A surface cleaner is a disc-shaped attachment with two or more rotating nozzles inside a shroud that mounts to your lance. The shroud contains overspray and the rotating nozzles cover large flat surfaces evenly - eliminating the stripe marks left by a single-nozzle pass. Surface cleaners are highly efficient for driveways, parking lots, sidewalks, concrete floors, truck beds, and any large horizontal surface. They typically double or triple cleaning speed on flat areas compared to a standard nozzle.
What is a pipe cleaning nozzle (mole)?
A pipe cleaning nozzle - often called a mole - is a tool for cleaning the interior of pipes, drains, culverts, and tubes. It has rear-facing jets that propel the tool through the pipe using the reaction force of the water, while forward-facing or angled jets clean the pipe wall. Moles are available in sizes matched to different pipe diameters. They are used in drain cleaning, sewer jetting, and industrial tube cleaning. Proper jetting hose (rated for the application) is required - standard high-pressure hose is not suitable for pipe jetting.
How do I choose a hose reel for my pressure washer?
A hose reel must be pressure-rated above your system's operating pressure. Key considerations: live swivel coupling (allows the reel to rotate while pressurized without twisting the hose), material (stainless steel for commercial durability), reel capacity (enough to hold your hose length without binding), and inlet/outlet connection compatibility with your machine and hose fittings. A quality hose reel protects hose from damage, reduces kinking and tripping hazards, and speeds up setup and teardown significantly.