Which adaptor do I need for my pressure washer?

It depends on your machine's gun-to-lance ending. Karcher K-series machines (K2 to K7) use a bayonet fitting, so they need a Karcher bayonet adaptor, and AVA machines share that same Karcher-style ending, so a Karcher-fit lance connects to an AVA too. Nilfisk machines use their own quick-release system and need a Nilfisk-specific adaptor. Kranzle machines use an M22 14mm threaded ending. Many aftermarket lances and stubby guns use a universal 1/4" quick-connect (QC). If you're unsure, check whether your lance twists and locks (bayonet), pushes in with a collar (quick-connect), or screws on (threaded).

Can I use my Karcher foam lance on a Nilfisk or Kranzle?

Not directly, as these machines don't share a fitting. A Karcher lance uses a bayonet end, a Nilfisk needs its own quick-release adaptor, and a Kranzle uses an M22 14mm thread, so you fit the adaptor that matches the machine you're moving to. The one easy swap is AVA: AVA machines use the same Karcher-style lance ending, so a Karcher-fit lance connects to an AVA with no adaptor at all. The hoses differ, but the lance end matches.

What is the difference between a bayonet and a quick-release connector?

A bayonet connector twists and locks: you push the lance in, rotate it, and it seats under spring tension. Karcher K-series guns and AVA machines use this style of lance ending. A quick-release or quick-connect connector pushes straight in and locks with a collar, with no rotation. Nilfisk uses its own quick-release system, and the universal 1/4" quick-connect used by many aftermarket lances works the same way. Kranzle is different again, using an M22 14mm screw thread. Because the systems aren't interchangeable, matching the adaptor to your machine is what matters.

How do I stop my foam lance leaking at the connector?

Leaks at the connector are almost always caused by a worn or missing O-ring, which sits inside the connector and creates the pressure seal. Once it deforms or splits from chemical exposure, the connection weeps under pressure. Check the O-ring on both the lance fitting and the gun connector, and make sure the connector is fully seated before pressurising, as a half-clicked quick-connect will always leak.

What size measuring cup do I need for snow foam dilution?

A 100ml measuring cup is the most practical size for foam lance dilutions. Most foam lances have a 1 litre bottle, and typical product doses range from 50ml to 200ml per fill depending on your target PIR (product injection ratio) and the specific product. A 100ml cup lets you measure accurately across that range without overfilling.

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Snow Foam Lance Adaptors & Accessories

Everything you need to connect your foam lance to any pressure washer — and keep it running. This collection covers the missing links in your foam setup: adaptors that bridge different connector standards, spare and replacement bottles, measuring cups for accurate dilution, and holders to keep your lance safe between washes.

Connector compatibility is the most common frustration when buying a new foam lance, because the right fitting depends on your machine. Karcher K-series machines (K2 to K7) take a bayonet adaptor, and AVA machines share that same Karcher-style lance ending. Nilfisk machines need their own quick-release adaptor, while Kranzle machines use an M22 14mm thread. Many aftermarket guns and lances use a universal 1/4" quick-connect. Check your machine's ending before ordering and pick the matching adaptor — if your lance stopped connecting after a pressure-washer upgrade, the right fitting is in here.

Wear and tear is the other reason to keep this page handy. Connectors and bottle threads take a beating from repeated chemical exposure, so a spare bottle or replacement adaptor — at a few pounds — saves you replacing the whole lance. Browse the range below and get your foam setup running exactly as it should.