Moka Pot Double Valve Core Set Universal For 2/4Cups Dual Valve Mocha Pot Accessory Valve core Sealing Ring and Booster Plug Moka Pot Double Valve Core Set Universal For 2/4Cups Dual Valve Mocha Pot Accessory, Valve core Sealing Ring and Booster Plug. Double-valve Moka pot - Boost valve rubber ring. Material of the turbocharger valve: aluminum alloy. Seal ring material: food-grade silicone It is recommended to replace the sealing ring every 200 uses or once a year, and the usage effect will be better! Attention: The stainless steel Moka pot cannot be used! Boost valve screw core diameter: 9 mm. Total length of the turbocharger valve: 21mm Package included 1set Dual Valve Mocha Pot Accessory Tips 1.For ,we will offer discount. 2.For ,we could send the goods to your customers directly and won't leave information about us if you'd like to. Shipment Please fill in your full name and correct address, we are not responsible for your mistakes.we will try to send you in 3 days,please wait it patiently. After-sale Service If you are not satisfied with the items, please feel free to contact me for solution instead of leaving neutral or negative feedback, which means you do not need our after-sale service. We will try our best to solve the problem