Reference

Pressure washer connections: M22, quick-connect and bayonet

Pick a connection standard to see how to identify it, which machines and parts use it, which standards it meets only through an adapter, and the adapters made for it.

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Choose your connection standard to see the key facts and what fits. Each fact links to its source on the full page.

Fits the most connection standards

Fits 2 of 6Westinghouse PWEXT extension wand kit for pressure washers, 4,000 PSI, 4 GPMExtension wand kit with metal gun, gutter wand, 30° angle wand and 5 QC tipsCheck price on Amazon

All connection standards

M22 x 1.5, 14 mm How to recognize an M22 fitting with a 14 mm stem, why it leaks in a 15 mm bore, which makers state 14 mm, and the adapters sold for it.3 products that fit
M22 x 1.5, 15 mm The M22 15 mm fitting: why a 15 mm stem will not enter a 14 mm bore, the adapters makers sell between the two, and what no source says about who uses 15 mm.
3/8 in quick-connect The 3/8 in quick-connect on pumps, hoses and guns: plug vs coupler, makers that state it, the M22 adapters sold for it, and the ratings on its parts.3 products that fit
1/4 in quick-connect The 1/4 in quick-connect at the wand outlet: which wands, tips, turbo nozzles, surface cleaners and foam cannons use it, and why fit says nothing about rating.4 products that fit
NPT (tapered pipe thread) How to recognize NPT: a 60-degree tapered thread with 18 TPI at 1/4 and 3/8 in that seals with sealant, the FPT and MPT ports on pro guns, and its BSPT look-alike.1 product that fit
BSPP and BSPT How to recognize British Standard Pipe threads: 55-degree BSPP (parallel) and BSPT (tapered, 19 TPI at 1/4 and 3/8 in), how each seals, and the NPT look-alikes.
Garden-hose thread (GHT) The 3/4 in garden-hose thread at a pressure washer's water inlet: its size and pitch, the inlet-only quick connect kits, and the supply limits makers set.1 product that fit
Kärcher bayonet and Kärcher quick connect Kärcher's own hose quick connect and wand bayonet on its K-series guns: how they differ from M22, which kits Kärcher lists, and its reel and other-brand exclusions.