Kärcher, Nilfisk, Bosch — and back
Nothing on this site causes more wasted purchases than fittings. Kärcher's bayonet, Nilfisk's Click&Clean, Bosch's connector and the M22 thread used by most trade machines are four different systems, and an accessory bought for the wrong one is simply a wrong accessory. We map which system each brand uses and which adapters bridge them honestly.
The bridge between the domestic Kärcher world and the M22 trade standard.
The Nilfisk half of the same problem — and note the thread is female, not male.
Brass rather than plastic at the joint that carries the full pressure of the machine.
Identify your machine's connector — bayonet, quarter-turn, M22 thread — then the accessory's. Adapters are almost always named "from X to Y", in that order.
A 22-millimeter metric thread, very widespread on lances and hoses. Careful: it exists in two internal diameters, 14 and 15 mm (0.59 in), and they are not interchangeable.
Negligibly if it keeps the internal diameter. An adapter with a narrower passage creates a restriction that is genuinely felt at the nozzle.
A missing, dried-out or crushed O-ring, in that order of frequency. A new one costs a few cents and settles almost every case.
Technically often yes, but the accessory's permitted pressure must exceed the machine's. An accessory rated for 100 bar on a 150 bar machine is dangerous.
On threaded connectors without a built-in seal, one or two turns are enough. On an O-ring connector, tape adds nothing and gets in the way of tightening.
Brass if the adapter stays in place or is tightened often. Plastic for occasional use, accepting that it will not last several seasons.
No: inlet and outlet carry different threads, male one side and female the other. An adapter fitted backwards will not screw on, and two adapters in series often solve the case.
An adapter recovers an accessory instead of buying another, provided you check two things: the direction of the connection and the permitted pressure. The O-ring is the part that decides the seal, and it is the one nobody thinks to replace.
A figure has to be published by four machines in five to earn its column. Below that, we would be comparing empty cells.
| Model | Price | From | To |
|---|---|---|---|
| Gammaeon M22 Brass Quick Coupler | — | M22 | K-series connection |
| M&M Smartek Adapter Option D — Nilfisk to M22 female | — | Nilfisk Click&Clean | M22 female thread |
| M&M Smartek Adapter Option A — Kärcher to M22 male | — | Kärcher bayonet | M22 male thread |
Specifications: manufacturer sheets for cleaning machines and the matching Amazon product pages. Prices and availability: Keepa. Every figure in this table names its source.
Most recent revision in this category: August 15, 2026.