From the product description, check product page for current description, price and availability:

• Stainless steel 0.5 Micron Carbonation Diffusion Stone
• Keg Lid with stainless Ball Lock Post, Silicon Keg lid Seal
• Replace your old bent,dented,or leaking lids.
• Easy Speedy carbonation. No need to shake your keg with this keg lid kit.
• Release pressure to remove lid. Working pressure 130 PSI (900 kPa)

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