Pressure Washer Guns, Nozzles and Spare Parts

PSI, GPM and the connectors that must agree

Most accessories list a maximum pressure in PSI and a flow in GPM, and both must be at least as high as your pressure washer produces. Fittings must agree as well. Common types are M22 threaded connectors, found in 14 mm and 15 mm versions, and quick-connect couplers in 1/4 inch and 3/8 inch sizes. If a gun, hose and wand do not share a system, adapters bridge them, but each added joint is a possible leak. Hot-water use needs a hot-water rating.

Nozzle tips, guns and surface cleaners

Nozzle tips are color coded by spray angle: red is 0 degrees, a pinpoint jet that can etch surfaces; yellow is 15, green 25, white 40, and black is a low-pressure tip for soap. A surface cleaner is a spinning bar in a hood, sized by diameter such as 24 inch, which cleans flat concrete and decks quickly and evenly, but it needs enough flow to spin properly. When choosing a gun, check the inlet and outlet thread, the maximum pressure, and whether the trigger lock and swivel are metal or plastic.

Questions about Pressure Washer Guns, Nozzles and Spare Parts

What does M22 mean on a pressure washer fitting?

M22 is a metric thread 22 mm in diameter used on many washer hoses, guns and wands. The pin or bore inside is either 14 mm or 15 mm, and the two do not interchange, so check which your washer uses before choosing an adapter.

Can a 4000 PSI surface cleaner run on a smaller washer?

A higher-rated cleaner usually works on a smaller washer if the fittings match, because the rating is a maximum. The real limit is flow: with too few GPM it may spin slowly or not at all. Check the GPM the cleaner needs against your washer.

Which nozzle tip should I use for cleaning concrete?

A 25 degree green tip suits most general cleaning, and a 15 degree yellow tip removes tougher stains from hard surfaces such as concrete. Avoid the 0 degree red tip, which can gouge. Use the black low-pressure tip for applying detergent.