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[Solved] Connecting the dishwasher under the tap - Connecting the dishwasher under the ta

Koslo 24285 11
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  • #1 17300190
    Koslo
    Level 7  
    Posts: 6
    Rate: 13
    Good morning,

    I would like to connect the dishwasher hose under the tap. I saw such a possibility in foreign video, unfortunately in Polish sources there is no such instruction or diagram. Or maybe some of you have installed a tap adapter through some adapter? I will be grateful for your help. Attached is a type of tap, hose and adapter found abroad.
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    • Connecting the dishwasher under the tap - Connecting the dishwasher under the ta 20180627_141302_Film1.jpg (3.2 MB) You must be logged in to download this attachment.
    • Connecting the dishwasher under the tap - Connecting the dishwasher under the ta s-l300.jpg (13.09 KB) You must be logged in to download this attachment.
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  • #2 17300199
    daro31ie
    Automation specialist  
    Posts: 2431
    Help: 366
    Rate: 647
    Dude, you have to visit a DIY store and you'll get everything there.
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  • #3 17300225
    Kenworth 18
    Level 43  
    Posts: 11088
    Help: 2415
    Rate: 3702
    Hello.
    If there is a faucet, there should be valves under the sink from which it is supplied with cold and hot water.
    You can unscrew the cold water valve and use a tee:
    https://www.castorama.pl/produkty/instalacja/...ne/ocynk/trojnik-nakretny-1-2-ocynkowany.html
    Or like this:
    https://www.woda.com.pl/p760,ft04-przylacze-1-2-cala-z-polsrubunkami.html
    Screw the battery supply valve back into the T-piece and buy, e.g. a valve, to the other connection:
    https://www.castorama.pl/produkty/instalacja/...9__9xutURkataSX9oqgmigVizdSUJ0uMXfWoiluhHMsH- z3MBoC8QMQAvD_BwE
    Then, while the dishwasher is running, the batteries can be used simultaneously.
  • #4 17300238
    Koslo
    Level 7  
    Posts: 6
    Rate: 13
    Thank you for the quick answers, in castorama I heard that I have no chance to connect to the tap. The idea of connecting underneath is very good, but I still wonder if you can still connect directly under the tap.
  • #5 17300250
    Kenworth 18
    Level 43  
    Posts: 11088
    Help: 2415
    Rate: 3702
    In the battery you would have to unscrew the nut that holds the strainer, but there is a fine thread and you would have to look for an adapter having such an external thread terminated with a 3/4 thread whole and unfortunately I don't know if it will be available somewhere.
  • #6 17300270
    teskot
    Rest in Peace  
    Posts: 2969
    Help: 420
    Rate: 951
    I know that such solutions exist. Something reminds me that it concerns such small dishwashers, placed on the counter. What you can see in the 4th picture is the garden hose adapter and it is completely unsuitable. The adapter I mentioned has a valve with a tap that switches the water flow between the dishwasher and the spout. And in general, it seems that this adapter had a triple function because probably it was also used to remove dirty water from the dishwasher. Maybe someone from the home appliances website will say how much truth there is.
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    #7 17300294
    Kenworth 18
    Level 43  
    Posts: 11088
    Help: 2415
    Rate: 3702
    You cannot post links from a well-known auction site in the forum, so have a friend look for a reduction from the spout of the faucet on a 1/2 internal thread.
    After purchasing this, you still need to buy a nipple with external thread from 1/2 whole to 3/4 whole and you can connect the dishwasher hose under the battery.
    Unfortunately, this solution will prevent normal use of the battery, and maybe a better solution would be to use a tee under the sink, but it's your friend's choice.
  • #8 17300511
    Koslo
    Level 7  
    Posts: 6
    Rate: 13
    Thank you for the hints, I will try tomorrow the version proposed by my colleague Kenworth 18, because this is the direction. I will let you know what the final will be. Thank you!
  • #9 17302094
    Koslo
    Level 7  
    Posts: 6
    Rate: 13
    Hello,

    Castorama and smaller stores have failed to have a tap adapter to a different size, I will fight in gardening, on the Internet I saw an element that may turn out to be suitable. Best regards and thank you again for your quick help.
  • Helpful post
    #10 17302121
    Kenworth 18
    Level 43  
    Posts: 11088
    Help: 2415
    Rate: 3702
    Hello.
    I gave a friend where you can buy this reduction.
    If your friend doesn't want to wait for the shipment, I suggest visiting the water and sewage stores.
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  • #11 17311496
    Koslo
    Level 7  
    Posts: 6
    Rate: 13
    Welcome,

    Several gardening parts have become the solution. It was impossible for sellers of plumbing stores. The tap is out of service only when the dishwasher is running. Switching to the tap option takes a few seconds. Thank you for your comments and best regards.
    Attachments:
    • Connecting the dishwasher under the tap - Connecting the dishwasher under the ta 20180630_232118_Film1.jpg (1.16 MB) You must be logged in to download this attachment.
    • Connecting the dishwasher under the tap - Connecting the dishwasher under the ta 20180630_232130_Film1.jpg (4.7 MB) You must be logged in to download this attachment.
    • Connecting the dishwasher under the tap - Connecting the dishwasher under the ta 20180630_232147_Film1.jpg (1.47 MB) You must be logged in to download this attachment.
  • #12 17311498
    Koslo
    Level 7  
    Posts: 6
    Rate: 13
    As above in the description.
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Topic summary

✨ The discussion revolves around connecting a dishwasher hose directly under a tap, with users sharing various solutions and experiences. One suggested method involves using a tee fitting to connect to the cold water valve under the sink, allowing simultaneous use of the tap and dishwasher. Others mentioned the difficulty in finding appropriate tap adapters in local stores, with some users resorting to gardening supply stores for suitable components. The conversation highlights the need for specific adapters, including a reduction from a faucet spout and a nipple with external threads, to facilitate the connection. Ultimately, a solution was found that allows the tap to be used when the dishwasher is not in operation, with a quick switch between the two.
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FAQ

TL;DR: Typical mains pressure is 3 bar [WRAS, 2021]. "Use a tee under the sink" [Elektroda, Kenworth 18, post #17300225] Connect via a 1/2 inch tee plus 3/4 inch valve, or a proper faucet diverter—not a garden-hose adapter [Elektroda, teskot, post #17300270]

Why it matters: This FAQ helps renters/DIYers cleanly connect a dishwasher to a tap or under-sink line without losing sink use or risking leaks.

Quick Facts

  • Dishwasher inlet connection: Typical G3/4 (3/4" BSP) female on the hose; mate to a 3/4" male valve [Bosch, 2023].
  • Common European faucet aerator threads: M24x1 (male spout) and M22x1 (female spout) (“NEOPERL Aerator Thread Sizes”).
  • Supply pressure: Typical 3 bar; many dishwashers operate approx. 0.5–10 bar [WRAS, 2021]; [Bosch, 2023].
  • Backflow: EN 1717 requires protection; use a check valve or a washing-machine angle valve with non-return (“EN 1717 Backflow Prevention”).
  • Portable/countertop units often include a faucet diverter; water use approx. 7 L/cycle [Danby, 2022].

Can I connect a dishwasher directly to my kitchen tap?

Yes, if you use a faucet diverter that threads onto your aerator (M24x1 or M22x1) and provides a G3/4 outlet for the inlet hose. Avoid simple garden-hose adapters; they are “completely unsuitable” for dishwashers [Elektroda, teskot, post #17300270] Many countertop models include a diverter in the box [Danby, 2022]. Typical tap threads are M24x1/M22x1 (“NEOPERL Aerator Thread Sizes”).

What’s better: under-sink tee or tap adapter?

Under-sink tee keeps the faucet usable while the dishwasher runs. “Then, while the dishwasher is running, the batteries can be used simultaneously.” [Elektroda, Kenworth 18, post #17300225] A faucet adapter can work but may block normal use unless it’s a diverter [Danby, 2022]. Typical mains pressure is 3 bar, adequate for both branches if fittings are sized correctly [WRAS, 2021].

How do I tee into the cold feed under the sink (3-step)?

  1. Shut off water. Insert a G1/2 tee between the cold angle stop and the faucet hose [Elektroda, Kenworth 18, post #17300225]
  2. On the tee’s spare port, fit a washing-machine angle valve 1/2" x 3/4" (G1/2 to G3/4) (“Schell 1/2 x 3/4 washing machine valve – Castorama”).
  3. Connect the dishwasher’s G3/4 hose; open water and check for leaks (“Castorama 1/2" Tee Fitting”).

What exact adapters do I need to go from faucet spout to a dishwasher hose?

Identify your aerator thread. For a male M24x1 spout, use M24x1 female to G1/2 female, then a G1/2 male to G3/4 male nipple, then attach the hose [Elektroda, Kenworth 18, post #17300294] Aerator threads are fine and can be tricky to match [Elektroda, Kenworth 18, post #17300250] Common spout threads: M24x1 and M22x1 (“NEOPERL Aerator Thread Sizes”).

Is a garden-hose adapter okay for dishwashers?

No. The forum expert called the shown garden-hose adapter “completely unsuitable” due to mismatch and lack of proper control/diversion [Elektroda, teskot, post #17300270] Use a purpose-built faucet diverter that switches flow between the spout and appliance [Danby, 2022]. Typical faucet aerators flow 6–9 L/min at 3 bar, which diverters are designed to manage (“NEOPERL Flow Rate Guide”); garden fittings aren’t.

Will my faucet still work if I connect at the spout?

Only if you install a faucet diverter with a bypass. Without a diverter, the tap becomes unavailable while the dishwasher runs [Elektroda, Koslo, post #17311496] Countertop kits include quick-connect diverters that toggle between tap and appliance [Danby, 2022]. Expert tip: “Use a tee under the sink” to keep full tap function [Elektroda, Kenworth 18, post #17300225]

Which thread sizes and standards matter here?

Dishwasher inlets are typically G3/4 (3/4" BSP) female on the hose; they connect to a G3/4 male valve [Bosch, 2023]. Faucet supplies under-sink are commonly G1/2 (1/2" BSP) (“Castorama 1/2" Tee Fitting”). Faucet spouts use metric aerator threads, often M24x1 or M22x1 (“NEOPERL Aerator Thread Sizes”).

Do I need a check valve or backflow protection?

Yes. EN 1717 requires backflow protection to safeguard drinking water. Use an angle valve with an integrated non-return (or add a separate check valve) on the dishwasher branch (“EN 1717 Backflow Prevention”). Many washing-machine/dishwasher valves include this feature by design (“Schell 1/2 x 3/4 washing machine valve – Castorama”).

Should I connect to hot or cold water?

Follow the manual. Many dishwashers prefer cold, with optional hot up to approx. 60°C if allowed [Bosch, 2023]. Supplying too-hot water can impair detergents and increase scale. Typical mains pressure is 3 bar; stay within the appliance’s rated range [WRAS, 2021]; [Bosch, 2023].

How much flow do I need, and do diverters restrict it?

Dishwasher fill is intermittent and modest. Countertop units use about 7 L per cycle [Danby, 2022]. Typical faucet aerators deliver 6–9 L/min at 3 bar, which is ample (“NEOPERL Flow Rate Guide”); quality diverters maintain similar flow paths. Quote: “Use a tee… and buy a valve” for robust supply [Elektroda, Kenworth 18, post #17300225]

What tools and sealants should I use?

Use two adjustable wrenches, a bucket, and new flat washers where applicable. BSPP (G) threads seal with gaskets; use PTFE tape only on appropriate male threads, not on aerator gasketed joints (“ISO 228-1 (BSPP) thread sealing”). The under-sink tee plus angle valve approach is straightforward for DIYers [Elektroda, Kenworth 18, post #17300225]

Will this affect warranty or safety?

Manufacturers expect a fixed, accessible shutoff on a cold line; deviating from instructions can affect warranty [Bosch, 2023]. Always include backflow protection per EN 1717, and check for leaks after each change (“EN 1717 Backflow Prevention”). If in doubt, choose the under-sink tee method recommended by forum experts [Elektroda, Kenworth 18, post #17300225]
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