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

• Well Made & Great Quality: The keg post poppet is stainless steel. The O-ring is made from food grade silicone. It features an anti- corrosion/ heat resistance/ environmental that can last a lifetime
• Will Send The Extra O-ring: We will free send 8 pieces the o-ring. The washer on poppet valve will be broken after long time using. If broken, the poppet valve will leaks.So need you replace it
• Seal Well: The keg poppet valve has adequate spring force to seal under pressure.No air leak, no beer leaks
• Fit For Ball-lock: Keg The universal poppet is used for gas posts/ liquid posts/ ball lock kegs/cornelius kegs/corny keg/soda keg.Use our stronger keg poppets to replace a hardened and leaking poppet

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