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

• MATERIAL: Made of stainless steel, it is sturdy and durable
• SAFE TO USE: Anti-rust, corrosion resistant and safe to use
• INSTALLATION: Easy to use and install
• COST-EFFECTIVE REPLACEMENT PART: A cost-effective replacement part for homebrew keg
• APPLICATION: Fits for almost all ball and pin lock style keg posts

• Commentary: Pin Lock Keg Pricing and Availability
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• Build a Recirculating Draft Line Cleaning Pump
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• Bulk Keg Orings and Keg Parts Reference