The fit on my standard brew head is perfect—no more finicky wiggling to get the seal right. I popped one on this morning and the pressure held steady through the whole pull, which is exactly what I needed.
Hannah★★★★★
Three of my o-rings were starting to look worn, and these replacements fit the standard brew head perfectly—snug but not impossible to get in place. It's a relief to have spares on hand so I'm not stuck mid-espresso with a leak.
Emma★★★★★
Had to swap one out after a year of daily use, and the new rings seated snugly right away with no leaks on the next pull. Nice to have a spare set of six so I'm not scrambling mid-week. These are the exact ones for the standard brew head, so make sure you don't grab the SS piston version.