外部用逆止弁

Finally got my espresso machine pulling consistent shots again after installing this valve. The pressure balance feels much more stable during the whole brewing process.

Put this on my older espresso machine to fix the vacuum lock issue, and it fit perfectly without any modification. The seal is tight and the pressure balance is noticeably improved during each pull. Exactly what I needed to get consistent shots again.

Finally a valve that actually seals properly—the gasket is much firmer than the cheap plastic ones I've tried before. It snapped right onto my system without any wobble, and I haven't had a single vacuum leak since installing it. Really solid little piece for the price.