Washing machine hose leaking —
how to find it
and what to replace
A flat rubber gasket or mesh filter washer sits inside the threaded connection where the hose meets the tap or the back of the machine. When that seal fails, the joint drips. The hose body is often fine. The failed part is usually the seal inside the fitting. Replacing it is usually inexpensive and often takes only a few minutes.
Scope: This article covers visible water-side leaks and seal identification at external hose, tap and connector points. Do not work on a live electrical appliance, do not open sealed appliance internals, and follow the appliance manufacturer's instructions. If isolation, access or the source of the leak is unclear, use a competent plumber or appliance engineer.
First — find exactly where the leak is coming from
Before replacing anything, dry the area around the hose with a cloth and run a short cycle. Watch carefully to identify the exact leak point. The location tells you what to replace.
The two seals — gasket and mesh washer
Inside each threaded end of a washing machine inlet hose there is a flat seal. It sits in a recess inside the fitting and is compressed between the fitting face and the tap outlet or machine inlet face when the connection is tightened.
Flat rubber gasket: a plain flat ring of rubber. Seals the connection and nothing else. Found at both the tap end and the machine end in many standard hoses. When it hardens or cracks, the joint weeps. For potable water connections, the replacement gasket material should be suitable for water-contact duty. In most household repairs, the immediate priority is to match the seal type and size correctly, then confirm the material is appropriate for the service.
Mesh filter washer: a flat rubber ring with a stainless steel mesh screen bonded into the centre. Seals the connection and simultaneously filters debris from the incoming water supply. Protecting the solenoid valve inside the machine from scale and sediment is its secondary function. Often found at the machine end of the inlet hose, though some hose designs also use them at the tap end. When the rubber surround degrades the connection leaks. When the mesh blocks, the machine may have difficulty filling.
Which one does your hose use? Unscrew the hose fitting from the tap and look inside the fitting end. If you see a plain black or grey rubber ring, it is a flat gasket. If you see a metal mesh screen surrounded by rubber, it is a mesh filter washer. Both are replaced the same way — the old one comes out, the new one drops in.
Why PTFE tape usually does not fix this
A common attempted fix is to wrap PTFE tape around the thread of the tap or hose fitting before reconnecting. This does not address the problem.
Washing machine hose fittings are flat face connections — the seal forms between the flat end of the fitting and the flat face of the tap outlet, through the gasket compressed between them. The thread provides clamping force only. PTFE tape is for tapered thread connections where the thread itself seals. On a flat face connection, tape on the thread does not create a seal and may prevent the faces from closing correctly.
If the joint still drips after fitting new PTFE tape, it is because the gasket — not the thread — is the sealing element, and the gasket has not been replaced.
How to replace the seal
Turn off the water supply
Close the tap the hose connects to. If there is no isolating tap, turn off the mains supply. Have a towel ready before disconnecting.
Unscrew the hose fitting
The hose fitting is hand-tightened in most installations — try by hand first. If it is tight, use pliers with a cloth to protect the fitting surface. Unscrew the fitting from the tap. Have a towel ready for residual water.
Remove the old seal
Look inside the fitting end. The gasket or mesh washer sits in a shallow recess. Hook it out carefully with a blunt tool. Avoid scoring the recess surface.
Check the seal size
For many standard washing machine inlet hoses, the connection is 3/4 inch and a common seal size is around 24×16×2mm, though variations exist between hose manufacturers. Check the old seal dimensions if possible before replacing.
Fit the new seal and reconnect
Drop the new seal into the recess — it should sit flat. Reconnect according to the appliance and hose instructions. Hand-tighten unless the manufacturer specifies a further turn or torque; do not apply a universal quarter-turn with pliers to a plastic nut or inlet valve. Turn on the supply and check for drips during the first fill cycle.
If the connection still drips after replacing the seal: check that the new seal is the correct size and is seated flat in the recess — a folded or misaligned seal will not form a complete seal. Also check the condition of the tap outlet face. If the tap face is badly corroded or damaged, even a new seal may not seat evenly and the connection may continue to leak.
Common sizes for washing machine hose seals
Most UK and European washing machine inlet hoses use a 3/4 inch BSP connection at both ends. The flat seal inside each fitting is typically one of the following sizes:
- 24×16×2mm — the most commonly encountered size for standard 3/4 inch washing machine hose fittings
- 24×16×2.5mm — a slightly thicker variant used in some hose brands
- 24×18×2mm — a wider bore variant used in some fittings
Dishwasher inlet hoses typically use the same 3/4 inch connection and the same seal sizes. Always check the actual fitting size before ordering — measuring the old seal is more reliable than assuming.
Sizes are indicative for common European washing machine and dishwasher inlet hoses. Actual dimensions vary by manufacturer and hose series.
For connection leaks, the seal is usually the problem rather than the hose body itself. Find the exact leak point, identify the seal type, replace it.
Find the exact leak point first — tap end, machine end or hose body. For connection leaks, identify whether the fitting contains a flat gasket or a mesh filter washer. Replace it with the correct size. Do not attempt to fix a flat face connection leak with PTFE tape — the tape is not the seal on this joint type.
FAQ
Why is my washing machine inlet hose leaking at the tap?
The most common cause of a washing machine inlet hose leaking at the tap connection is a failed flat gasket or mesh filter washer inside the hose fitting. These are flat sealing rings or mesh filter washers that sit inside the threaded end of the hose where it connects to the tap. Over time they harden, compress flat or crack, and the joint starts to drip. The hose itself is usually not the problem. Replacing the gasket or mesh washer often stops the leak without replacing the hose when the hose body itself is sound.
What is the mesh washer inside a washing machine hose fitting?
A mesh washer is a flat rubber washer with a stainless steel filter screen bonded into the centre. It sits inside the threaded end of the inlet hose where it connects to the tap or to the back of the machine. It serves two functions: it seals the connection and filters debris from the incoming water supply to protect the solenoid valve inside the machine. When the rubber surround degrades the joint leaks. When the mesh blocks with scale the machine may fail to fill. Both require replacement of the washer.
Can I stop a washing machine hose leak with PTFE tape?
PTFE tape is usually not the correct solution for a washing machine hose connection leak. The hose fitting uses a flat face seal — a rubber gasket or mesh washer compressed between two flat faces. PTFE tape is for tapered thread connections where the thread itself seals. Wrapping PTFE tape around a washing machine hose thread may temporarily reduce dripping but it does not address the failed gasket and is not a reliable long-term fix. The usual repair is to replace the flat gasket or mesh washer inside the hose fitting after confirming the leak is at the connection.