Identify your pressure washer connections
Replacing a hose, gun or lance? Start with the connection already on your equipment. These illustrations show the features worth photographing and checking before choosing a replacement.
Idro’s view: A useful match needs the connection, seal and operating ratings checked together. If the markings are unclear, send us what you can see and we will help with the next step.
Before inspecting a fitting: follow your machine’s instructions to stop and isolate it, release trapped pressure and allow hot parts to cool. Never loosen a pressurised connection. Photographs of fitted parts are fine; you do not need to dismantle equipment for an enquiry.
Three connection types to recognise
Use the drawings to spot useful features. They are schematic illustrations, not dimensional drawings or confirmation that two fittings will connect.
M22 screw coupling
Look for a screw-on collar or external metric thread with a central sealing connection. A common pressure-washer thread is M22 × 1.5.
Before ordering: Check the thread and the centre stem or bore. M22 fittings can use different sealing dimensions, including 14 mm and 15 mm versions. Photograph the centre and check the exact fitting specification.
Threaded fitting
Record whether the thread is outside (male) or inside (female). BSP, NPT and metric threads are different systems.
Before ordering: Include the thread marking, outside diameter of an accessible male thread, and pitch if known. Confirm whether the thread is parallel or tapered and how the joint seals. The named pipe size is not its measured outside thread diameter.
Quick-release coupling
A plug fits into a matching socket. Photograph the plug’s complete profile and the socket, including any release collar and manufacturer markings.
Before ordering: The coupling system and plug profile must match. A size such as ⅜-inch may describe the threaded back of a fitting; it does not identify every quick-release profile. Show both sides.
Photographs that help us check the match
- The complete assembly: show where the fitting sits on the hose, gun, lance or machine.
- Both ends: a straight-on view and a side view of each connection, if accessible safely.
- Readable references: photograph any part number, hose markings and the machine’s model or serial plate.
- Any existing measurements: show the measurement position and state the units. A ruler in a photograph helps with context; calipers are more useful for a small diameter.
Measurements and markings to include
| What you can check | What to send |
|---|---|
| Threaded connection | Male or female, any thread marking, accessible male thread outside diameter and pitch if known. Leave unknown details as unknown. |
| M22 centre connection | A clear picture of the centre stem or bore and seal. Include a safely accessible measurement, noting exactly where you measured. |
| Quick-release connection | Side-on plug profile, socket markings and the coupling make or system if known. Include the threaded back connection as a separate detail. |
| Hose or gun assembly | Both end connections, hose length and markings, machine model, and the pressure, flow and temperature figures from its specification if available. |
Check the working conditions too
A connection that appears to fit still needs the correct seal arrangement and equipment ratings. Check the documented working pressure, temperature and suitable flow for the complete assembly. For hot-water equipment, the temperature rating matters as well as pressure.
If a thread starts reluctantly, a plug profile differs, or a reference is missing, stop and ask us to check it. An adapter also needs both connections, the sealing method and the operating ratings confirmed.
Back to datasheets, help and calculators →
Technical references
The identification points above were checked against manufacturer information. Always use the instructions and specification for your exact equipment.
Parker thread-identification reference (PDF) ↗ · R+M / Suttner M22 fitting example ↗ · Manufacturer guidance on M22 sealing sizes ↗