The small copper washer that makes a screw fitting tight again
Copper is soft. That is exactly why it sits on screw fittings that have to be tight: when tightened, the metal settles into every unevenness of the two surfaces and fills it. However, this only really works once. If you fit a compressed copper washer a second time, you end up retightening it, and after the next heat-up it starts dripping again.
This washer measures 10 × 14 × 1,5 mm and carries the part number L100/D. It is the smallest of the copper washers we stock.
When it is due
There is a drop on the screw fitting or a limescale trail is forming, even though it is tight. The old washer is visibly flattened, notched or has tarnished dark. Or you have just undone the connection – in which case a new copper washer always goes in when you reassemble it.
At a glance
| Type |
Washer, copper |
| Installation location |
on a screw fitting in the water circuit. The documentation does not state an installation point for this item. |
| Fits |
The documentation does not name a machine. Send us the serial number and we will check the fit. |
| Scope of delivery |
one washer |
| Part number |
L100/D |
| Version |
10 × 14 × 1,5 mm, copper |
| Installation |
Installation by a specialist recommended |
| Brand |
La Marzocco |
Important for installation
The washer sits on a pressurised screw fitting. Only work on the machine when it is switched off, cooled down and depressurised. A copper washer is replaced whenever a connection is opened, not reused, and the screw fitting is not tightened beyond feel – more torque does not make a leaking joint tight. We deliberately do not give step-by-step instructions here.
Washers and shim washers in our catalogue
With a shim washer, what matters is the material, inner diameter, outer diameter and thickness – the name alone is never enough. We stock these items:
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Ø 30 mm outer: I.1.091, 14,2 × 30 × 2 mm, steel, I.6.005, 14,1 × 30 × 2 mm, Teflon, I.1.033, 10,7 × 30 × 1,8 mm, stainless steel A2 and F.1.032, 10 × 30 × 2 mm, PTFE
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Smaller sizes: L100/D, 10 × 14 × 1,5 mm, copper (this item), L165/2, 16,5 × 26 × 1 mm, brass and I.1.170, 14 × 7 × 0,5 mm, brass
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Copper washers for the pump: L180/1, 22 × 17 × 1,5 mm, L100/1A and L4002
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Without dimensions: I.6.024, without scratch protection
Two washers of almost the same size are not interchangeable if the material is different: a copper washer is allowed to settle, a Teflon washer springs back, a steel washer stays hard. If in doubt, the number on your old part decides.
Who it is for
For workshops that close every opened screw fitting with new copper washers during an overhaul, and for anyone looking for exactly this washer with the number L100/D from a piece of service documentation.
What goes with it
We stock the larger copper washers as L180/1 and L4002; the copper gasket for the brew group vent goes with them. All small parts are listed in the Original spare parts section, the rest of the range under La Marzocco accessories and spare parts.
From our workshop
In Bern and Zurich we always keep a few of the common copper washers in the drawer – not because they break often, but because otherwise an overhaul gets held up by a two-franc washer and the machine stays open a day longer. That is our routine, not a manufacturer requirement. What is in the cup in the meantime: Nutty Delight, Cozy Chocolate or Very Nutty. More under Coffee beans.
No returns
Original spare parts are excluded from exchange and return. They are sourced specifically for each order and cannot be resold after installation or a trial fitting on the machine. So before ordering, check the model, year of manufacture and serial number of your machine – or drop us a line and we will clarify the fit together. Your rights in the case of defective goods remain unaffected.
Frequently asked questions
Which machine does this washer sit on?
Our documentation does not say, so we do not claim it. What is reliable is the number L100/D and the size 10 × 14 × 1,5 mm. Send us the serial number and we will check the fit.
Can I reuse the old copper washer?
Better not. Copper seals by deforming the first time it is tightened. The second time, it lacks this ability to deform, and the connection tends to start leaking again.
How does it differ from the other copper washers?
In size. L100/D measures 10 × 14 × 1,5 mm, L180/1 measures 22 × 17 × 1,5 mm, L100/1A and L4002 are separate items. All four are linked in the section above.
How many do I get?
One washer per order unit. If you are planning an overhaul, it is best to take a few more right away.
Can I see the part at your shop?
Yes. We are happy to show it to you in our showroom in Bern at Gerberngasse 44 and in Zurich at Hagenholzstrasse 50b.
Questions about the fit? Write to us at [email protected]. We deliver across Switzerland and to Liechtenstein in 2-4 working days.
