Hose Outlet Connector with Check Valve M22x1.5

Connector 405221 is the outlet component of the Kranzle AQ series pressure washer pump connecting the pump outlet to the high-pressure hose. On the pump side it screws in with a ¼" thread into the valve block; on the hose side it has an M22x1.5 thread as the working hose connection. Inside the connector there is a built-in check valve mechanism – ball 10mm (12122), spring (141201) and O-ring 18x2 (40016). The connector is available in the version without injector – meaning it has no channel for drawing in detergent.

Application

The connector is mounted in the outlet bore of the AQ pump valve block. The ¼" thread screws into the pump; the M22x1.5 thread accepts the high-pressure hose end. The built-in ball check valve operates in the same way as the valves in the valve block – during the delivery stroke the ball lifts and passes water to the hose; when the pump stops, the spring presses the ball against its seat and prevents water from flowing back from the hose into the pump. The version without injector is intended for use with water only – without connecting a detergent tank through a suction channel.

Replaced when the connector body is mechanically damaged, the M22x1.5 or ¼" thread is damaged, the built-in check valve leaks, or when the existing connector has an injector and the version without one is required.

Symptoms – when to replace

• Water leak at the M22x1.5 or ¼" thread – damaged thread or absence of proper sealing between the connector and the hose or valve block.
• Water leak from the connector body under working pressure – worn O-ring 18x2 (40016) or cracked body.
• Pressure pulsation or water flowing back into the pump on shutdown – worn ball or spring of the built-in check valve.
• Visible mechanical damage to the body – denting, cracking or corrosion preventing a secure connection to the hose.
• Stripped or rounded M22x1.5 thread – hose end screws in with resistance or shows play after tightening.

How to select the right part

Three parameters must match simultaneously: pump connection thread ¼", hose connection thread M22x1.5, and the version without injector. Before ordering, confirm that the removed connector has no injector channel – the presence of an additional side bore or suction tube seat indicates the injector version, which has a different reference number.

Connector 405221 contains the same ball mechanism as valve plug 40522 – ball 12122, spring 141201, O-ring 40016 – but these are two different parts with different installation positions. Plug 40522 screws directly into the valve block bore; connector 405221 is an outlet component with two threads connecting the pump to the working hose. They are not interchangeable.

If the problem concerns only the built-in check valve with the connector body intact – the mechanism components (12122, 141201, 40016) may be available separately.

Compatibility

Outlet component for Kranzle AQ series pressure washer pumps. Pump thread: ¼". Hose connection thread: M22x1.5. Version without injector. Contains check valve mechanism: ball 10mm (12122), spring (141201), O-ring 18x2 (40016). Verify the exact compatibility range by reference number 405221.

[faq]

How does connector 405221 (without injector) differ from the injector version, and when is each required?|The injector version has an additional suction channel – a side bore with a tube seat through which the pump draws detergent from an external tank during water flow. The version without injector (405221) does not have this channel and is intended for use with water only.

How does this connector differ from valve plug 40522 if both contain the same ball components?|Both components contain an identical check valve mechanism (ball 12122, spring 141201, O-ring 40016), but they serve different functions and have different installation positions. Plug 40522 screws directly into the valve block bore of the pump and closes the valve channel from the outside. Connector 405221 is an outlet component with two threads – it connects the pump to the working hose and contains its own check valve as a functional outlet element. They are not substitutes and cannot be used interchangeably.

How to service the built-in check valve without replacing the entire connector when the body is intact?|Unscrew the connector from the valve block and remove the ball mechanism from the inner side. Removal sequence: O-ring 40016 at the ¼" thread, then spring 141201, then ball 12122. Before fitting new components, clean the ball seat in the connector body – limescale deposits on the seat edge will prevent a tight seal even with a new ball. Fit in reverse order: ball, spring, O-ring. Check for leaks on first start-up.

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