Karcher Pressure Washer Piston HR - Detergent Connection 22mm (9.002-028.0)

Karcher Pressure Washer Piston HR 9.002-028.0 - Detergent Connection 22mm

Name: Karcher Pressure Washer Piston HR 9.002-028.0 - Detergent Connection 22mm
Brand: Karcher
SKU: 9.002-028.0
Price: 54.75 AUD
Availability: InStock

SKU 9.002-028.0

BARCODE 4039784984141

By: Karcher

$54.75 - $54.75

$54.75

$54.75 - $54.75

$54.75

Availability: 7 in stock ready to be shipped or picked up

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Delivery Options:

→ Pickup available at: 208 Princes Highway, Arncliffe.
→ Same day delivery within Sydney, Australia.
→ We ship nationwide.

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Product Description

Karcher Piston HR with 22mm Detergent Connection (9.002-028.0)

Restore the vital chemical cleaning capabilities of your machine with the Karcher Piston HR & Detergent Connection (9.002-028.0). This highly specific, genuine OEM spare part serves a dual purpose within your pressure washer's internal pump assembly. Primarily, it acts as the precise injection point for your cleaning chemicals, utilizing a 22mm connection to properly mix detergents into the water stream. Secondly, the integrated HR piston plays a crucial role in maintaining overall system integrity, ensuring accurate pressure regulation across the entire pump.

When the internal seals on the detergent piston wear out, or the 22mm connection nipple cracks due to age or frost, the pressure washer will completely lose its ability to siphon soap. Even worse, a cracked connection can introduce air into the pump, causing the machine to pulse violently and lose high-pressure output. By replacing the faulty unit with this durable, factory-tested Karcher pressure washer spare part, you guarantee proper detergent mixing and restore flawlessly smooth motor operation. It is an essential fix for users who rely on heavy degreasers and car wash soaps for effective high-pressure cleaning.

Who Is This Detergent Connection Piston Ideal For?

This genuine Karcher component restores soap siphoning and cures air leaks. It is highly recommended for:

Car Enthusiasts & Detailers: Fixing machines that refuse to draw car wash soap or snow foam through the internal detergent line.
Appliance Repair Technicians: Sourcing exact-fit, OEM components to professionally cure machine pulsing and chemical injection failures for clients.
DIY Homeowners: Safely repairing a cracked detergent nipple on their own machine, saving the immense cost of replacing the whole pressure washer.
Commercial Cleaners: Ensuring their equipment can reliably siphon heavy-duty degreasers for fast, effective driveway and brickwork restoration.

Key Features and Performance Benefits:

Restores Chemical Injection: Fixes the common issue where the pressure washer completely refuses to draw soap from the detergent bottle.
Cures Air Leaks & Pulsing: A cracked detergent connection sucks air into the pump, causing severe machine pulsing. This new part restores an airtight seal.
Genuine OEM Precision: Manufactured by Karcher (Part 9.002-028.0) to guarantee a flawless, watertight fit inside your specific pump block.
22mm Detergent Connection: Specifically engineered to perfectly match Karcher's 22mm internal chemical suction hoses and fittings.
Durable Construction: Built from high-strength, chemically resistant polymers designed to withstand harsh alkaline degreasers and continuous high pressure.

Technical Specifications:

Brand: Karcher (Genuine OEM Replacement Part)
Product Type: Piston HR – Detergent Connection
Part Number: 9.002-028.0
Connection Size: 22 mm
Compatibility: Selected Karcher pressure washer models (Check parts diagram for exact fitment)
Function: Controls detergent flow, chemical mixing, and assists in pressure regulation.

Fix your soap injector and restore full pressure. Available for nationwide delivery.

Delivery Information

Dispatch: Items marked as “In stock” or “Ready to be shipped” are usually dispatched within 1 business day after payment is received. If an item is not in stock and ordered from our supplier, please allow 3–5 business days for processing before it is ready for delivery or pickup. All standard delivery options still apply.

Shipping: Delivery costs are calculated at checkout based on your location and order size. Bulky items and chemicals may attract additional freight charges and cannot be sent to PO Boxes.

Delivery: Parcels are delivered by road freight. Authority to leave may be used if no one is available to receive the order. For full details, please see our Shipping & Delivery Policy

Business days to delivery

NSW
City	1 Day
VIC
Melbourne	1 Day
Regional	3–4 Days
QUEENSLAND
Brisbane	1–2 Days
Regional	3–4 Days
SOUTH AUSTRALIA
Adelaide	2–3 Days
Regional	4–5 Days
NORTHERN TERRITORY
All Areas	4–6 Days
WESTERN AUSTRALIA
All Areas	4–6 Days
TASMANIA
All Areas	4–6 Days

Frequently Asked Questions

How do I know if my detergent connection is broken?

The most obvious sign is that your pressure washer no longer sucks up soap when you use the low-pressure setting. Additionally, if the plastic nipple is cracked, it will suck air into the pump, causing the machine to pulse rapidly and lose high pressure.

What does the '22mm' refer to?

The 22mm measurement refers to the physical size of the connection fitting where the internal clear plastic chemical suction hose attaches to this piston assembly.

Will this part fit my Karcher K2?

Karcher utilizes many different internal pump designs. You must check your specific machine's owner manual, parts diagram, or physically match the part number 9.002-028.0 to ensure this is the correct part for your model.

Why did this plastic part crack?

The most common reason for this part cracking is winter frost damage (water freezing inside the pump and expanding). It can also degrade and crack over time if highly corrosive chemicals (like pure bleach) are run through the detergent line.

Is this a genuine Karcher part?

Yes, this is a 100% genuine OEM Karcher spare part, guaranteeing precise dimensional accuracy and safety under extreme internal pump pressure.

Can I just glue the cracked detergent nipple back together?

No. The pump operates under extreme pressure and vibration. Glue or epoxy will not hold, and it will continue to suck air into the system and leak water. The part must be replaced completely.

Do I need special tools to replace this?

You will need Torx (star) screwdrivers to dismantle the main yellow plastic casing of your Karcher machine to access the pump. The detergent piston is usually secured within the pump block and can be carefully pried out.

Should I use grease when installing the new piston?

Yes, it is highly recommended to apply a very small amount of silicone plumber's grease to the rubber O-rings on the new part before inserting it. This ensures a perfect airtight seal and prevents the O-rings from tearing.

My machine draws soap, but it still pulses. Will this fix it?

If the machine draws soap perfectly and isn't leaking air from this specific connection, your pulsing issue is likely caused by a completely different component, such as a faulty unloader valve, a cracked cylinder head, or a blocked nozzle.

Can I run any soap through this connection?

To protect this plastic part and its internal seals, you should only use chemicals specifically formulated for pressure washers. Avoid highly viscous dish soaps or thick, un-diluted bleach, as they will clog or melt the internal valves.

Is it safe to do this repair myself?

Because you are opening the machine casing near electrical components and water, you MUST ensure the pressure washer is completely unplugged from the wall. If you are not confident, take it to a qualified appliance repair technician.

Do you offer trade discounts for vacuum and pump repairers?

Yes, Freshway Supplies provides highly competitive trade and volume pricing for appliance repair technicians and small engine mechanics. Contact us to establish your trade account for spare parts.