Valve Plug with Pressure Gauge Port M18x1,5 AG - 1/4" IG

Plug 410111 is a variant of valve plug 41011 (external thread M18x1.5) extended with an additional port for connecting a pressure gauge – internal thread 1/4" (designation GW). It combines two functions in one body: it closes a valve channel in the valve block of the Kranzle pressure washer pump and at the same time provides a seat for pressure measurement at that point in the circuit – without dismantling any hydraulic components.

Application

The plug is mounted in the valve block bore of the pump, at a position where both a channel-closing plug and diagnostic access for pressure measurement are required. The 1/4" GW gauge port is a threaded seat that accepts a pressure gauge connection, or is blanked off with a plug when no measurement is being taken. It allows pressure to be checked directly in the valve block with the pump running – useful for diagnosing whether pressure irregularities originate at the pump level or further along in the circuit.

Replaced when the main M18x1.5 thread is damaged, the body leaks, or the gauge port is damaged and no longer allows a secure gauge connection.

Symptoms – when to replace

• Water leak at the M18x1.5 thread – under working pressure or immediately after it drops.
• Leak from the 1/4" gauge port with the blanking plug fitted or the gauge connected – damaged port thread or its seal.
• Mechanical damage to the body – cracking, particularly around the gauge port, where the additional bore locally weakens the material.
• Damaged wrench seat on the plug body – secure removal without risk of damaging the valve block is no longer possible.
• Inability to connect the gauge to the port with a tight seal – damaged 1/4" thread after repeated connection and disconnection of the measuring instrument.

How to select the right part

Two parameters must match simultaneously: main external thread M18x1.5 and the presence of a 1/4" GW gauge port. The key difference compared to plug 41011 (without port) is an additional threaded bore in the body – visible as a side or front seat. Fitting plug 41011 where 410111 is specified removes the ability to measure pressure at that point; fitting 410111 where a plain plug was used is geometrically possible, but requires the gauge port to be blanked off to prevent leakage.

Before ordering, check the thread type of the gauge you intend to use – the 1/4" GW port (internal thread) accepts gauges or connections with an external 1/4" thread of the same type (parallel inch or taper – to be confirmed on the removed component).

Compatibility

Component of the valve block for Kranzle pressure washer pumps. Main thread: M18x1.5 external (AG). Gauge port: 1/4" internal (GW). Not a substitute for plug 41011 without a gauge port – it serves an additional diagnostic function. Verify the exact compatibility range by reference number 410111.

[faq]

How does 410111 differ from plug 41011, and when is the gauge port variant actually needed?|Both are valve plugs with an identical main thread M18x1.5, but 410111 has an additional 1/4" GW seat for connecting a pressure gauge. The port variant is needed where periodic or continuous pressure checking is planned at this point in the valve block – for example when diagnosing recurring pressure problems, or in washers running continuously, where pressure monitoring helps catch failures early. Where pressure measurement is never required, the simpler plug 41011 is sufficient.

Does any industrial pressure gauge fit the 1/4" GW port, or is a specific connection type required?|1/4" thread comes in several standards – parallel inch (G1/4"), taper inch (R1/4") or, less commonly, metric. The thread type in the 410111 port is G1/4". Before purchasing a gauge, measure or compare the port thread with the removed component – industrial gauges most commonly have a G1/4" parallel thread with a face seal, but using the wrong thread type can damage the port or fail to provide a seal.

How to use the gauge port to diagnose a pressure drop in the pump?|Connect a gauge to the port and start the washer with the gun open at stable engine speed. Compare the reading with the nominal value for the specific pump model. If the pressure at the port is correct but the pressure at the washer outlet is lower, the problem lies further along the circuit (accessories, hose, nozzle), not in the pump itself. If pressure is already low at the valve block port, look for the cause in the pump – valves, piston seals or the regulating valve. Locating the measurement point this way significantly shortens diagnostic time compared to assessment based solely on external symptoms.

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