Every Sage and Breville espresso machine ships with four baskets: a single wall basket for one cup, a single wall for two, a dual wall for one cup, and a dual wall for two. Most people use whichever one was fitted at the factory, and never find out that the choice decides almost everything else about their coffee.
This page explains the difference, how to tell which one you have in five seconds, and why we would rather you fixed this first than bought anything from us.
What the two baskets actually do
A single wall basket is a cup of steel with dozens of fine holes across the base. Resistance comes from the coffee itself. If the grind is too coarse, water runs straight through and the shot is thin and sour. If it is too fine, almost nothing comes out. The basket tells you the truth, and the truth is sometimes unpleasant.
A dual wall basket, also called pressurised, has a second wall underneath with a single small hole in it. Coffee sits in the inner cup, water passes through the grounds, and then has to squeeze out through that one hole. The pressure is created by the hole, not by the coffee. That is why a dual wall basket produces thick crema from almost any grind, including pre ground coffee from a supermarket bag.
How to tell which one you have
| Where to look | Single wall | Dual wall |
|---|---|---|
| Turn the basket over and look at the underside | Dozens of fine holes across the whole base | One small hole, on its own, in the centre |
| Look at the rim from the side | One thin wall of steel | Two walls with a gap between them |
| Weight in the hand | Lighter | Noticeably heavier for the same size |
| What Sage calls it in the manual | Single Wall Filter | Dual Wall Filter |
If you are on a dual wall basket, do not buy a bottomless portafilter yet
A bottomless portafilter exists to show you what the underside of your coffee puck is doing. On a dual wall basket there is nothing to show. The water leaves through that one small hole regardless of how the puck behaved, so what you would watch is the hole, not your coffee. You would have bought a diagnostic tool and switched off the diagnosis.
The same goes for a puck screen. A puck screen spreads incoming water more evenly across the bed. On a dual wall basket the bed is not what limits the flow, so spreading the water changes almost nothing you can taste.
Switch baskets first. It costs nothing and it is the single biggest change available to you.
Dual wall is the right basket for some people
If you buy pre ground coffee, or your grinder is a blade grinder, or you do not want to spend time dialling in a shot, stay on the dual wall basket. It was designed for exactly that, it does it well, and none of our products will improve your coffee while you are using it. That is not a sales technique, it is just what the parts do.
Everything below is for the other case: you have a grinder you can adjust, and you want to know why one shot is good and the next is not.
Moving to single wall, in order
1. Find the single wall basket you already own
It came in the box. If you still have the accessory tray, it is in there. If the machine was bought used and the baskets are missing, that is the one part worth replacing before anything else, and it costs a fraction of a portafilter.
2. Expect the first few shots to be worse
This is the part nobody tells you. A dual wall basket forgives a bad grind because it makes the pressure itself. Take that away and the grind has to do the work. Your first shots will probably run too fast and taste thin. That is not the basket failing, it is the basket finally telling you the truth.
3. Grind finer, one step at a time
Change one thing per shot and write down what you changed. Aim for a shot that takes roughly twenty five to thirty seconds from the moment you press the button, for about twice the weight of dry coffee you put in. Those are starting points, not rules.
4. Only then think about a bottomless portafilter
Once the basket is honest, a bottomless portafilter becomes useful, because what you see underneath is now your puck and not a valve. Until then it shows you nothing you can act on.
Where the accessories actually fit
Once you are on a single wall basket and roughly dialled in, two things become worth having, in this order.
A bottomless portafilter replaces the spouted one and lets you watch the shot leave the puck. It does not make coffee better on its own. It makes problems visible so you can fix them. What the different spray patterns mean is covered in the channelling guide.
A puck screen sits on top of the coffee, so the water arrives spread instead of arriving as a jet. It reduces one cause of channelling, and it keeps the shower screen clean. It does not fix a badly distributed puck, and nothing except better distribution does.
If you are not sure your machine takes 54 mm parts at all, start with the size guide. The Sage 54 mm fitting is a bayonet of their own design, so a 54 mm part from another ecosystem will not necessarily lock in.
The parts, if you want them
| Part | What it is for |
|---|---|
| 54mm bottomless portafilter | Seeing what the puck is doing. Only useful on a single wall basket. |
| 53.5mm puck screen | Spreading the incoming water, and keeping the shower screen clean. |
| Both together | The usual pairing, because the first shows the problem and the second removes one of its causes. |
Free delivery in the United Kingdom, and if a part does not fit your machine the return is free and we pay the postage. Tell us the model and we will answer the same working day.