Moka pot gasket replacement: sizes, prices, and how to fit one

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Replace a moka pot gasket when the pot hisses steam from the seam, brews slower than it used to, or the rubber has gone hard and glossy, which is usually every year of daily use. Bialetti sells the gasket and filter plate as one set sized by cup count, from $4.49 for the 1-cup set to $10.49 for the 9-cup set, and each of those sets contains three gaskets plus one filter plate. Size is by cup count, never by eye: a 3-cup gasket will not seal a 6-cup pot.

Bialetti gasket and filter sets by cup size

Prices and set contents from the Bialetti US spare parts shop, checked August 2026.

Check Bialetti gasket and filter sets by cup size prices on Amazon

Four signs the gasket is finished

Steam escaping from the seam between the top and bottom halves while it brews is the clearest one, and it means pressure that should be pushing water through the coffee is leaking sideways. The others: the pot needs noticeably more force to screw tight, brewing takes longer than it used to on the same heat, and the rubber has gone from matte and slightly tacky to hard, shiny, and cracked at the edge. A gasket that has been cooked flat will not spring back when you press it with a thumbnail.

Daily brewers usually get about a year out of one. If you brew a couple of times a week, expect longer. Heat cycles and dishwasher detergent both shorten it, which is one more reason moka pots get rinsed rather than washed.

Changing it takes about two minutes

Unscrew the pot, empty and dry the top chamber, then push the old gasket out from the top side of the funnel plate with a thumb. The filter plate sits under it and usually comes out with it. Wipe the groove clean, seat the new filter plate flat, then press the new gasket in behind it so it sits fully inside the lip with no bulge. Screw the pot back together, run one plain water cycle, and discard that first brew.

If the new gasket will not sit flush, you have almost certainly got the wrong cup size or you have left the old one in place underneath. Two gaskets stacked is a common cause of a pot that suddenly sputters instead of brewing.

Silicone gaskets, and where the aftermarket helps

Bialetti uses natural rubber on most Moka Express sets and silicone on some stainless models such as the Mokina and the 10-cup, per the same parts listing. Silicone tolerates heat cycles well and does not pick up flavor as fast, which is why aftermarket silicone gaskets are popular. The tradeoff is fit tolerance: silicone is slightly stiffer to seat, and a poorly moulded copy will leak worse than a tired original. Buy the size that matches the number stamped on the base of your pot, and buy a multi-pack, because you will need it again.

One thing a new gasket will not fix is a warped base or a stripped thread. If the pot leaks with a fresh seal, the geometry is gone and it is time to replace the pot.

Buy the right size

Match the cup number stamped on your pot. These searches are pre-filtered by size so you do not order a 3-cup seal for a 6-cup pot.

Related reading

• How to clean a Bialetti moka pot
• Moka pot not brewing or sputtering
• The moka pot brewing guide
• Fix your coffee maker hub

FAQ

How often should I replace a moka pot gasket? About once a year with daily use, and sooner if steam escapes from the seam or the rubber has gone hard and shiny. Bialetti sells them three to a set, which is roughly three years of spares.

Are moka pot gaskets universal? No. They are sized by cup count, and the number is stamped on the base of the pot. A 3-cup gasket will not seal a 6-cup pot, and Bialetti lists separate sets for 1, 2, 3 and 4, 6, and 9 cup models.

Can I use a silicone gasket instead of rubber? Yes, and Bialetti itself uses silicone on some stainless models such as the Mokina and the 10-cup. Silicone handles repeated heat cycles well; just make sure it seats fully flush, because a proud gasket leaks worse than a worn one.