Stainless steel ball lock carbonation caps.  These are intended to convert 1L and 2L bottles to pressurized growlers.  Fill up a 1L or 2L PET bottle with your beer.  Put one of these on (purge the head space by squeezing if you want to) and then pressurize for transport.  You can also use this cap to rapidly carbonate beer.  Same process as for transport, just shake it up until it’s carbonated.

Other possible uses… One of these along with some tubing are all you need to convert Mark II Keg and Carboy Washer [Review] to a recirculating draft line cleaning pump for ball lock setups.  See: Mark II Keg & Carboy Cleaner… As a Recirculating Draft Line Cleaning Pump!  – OR – Build your own line cleaning setup from scratch… Build a Recirculating Draft Line Cleaning Pump

As if this posting, this is eBay offering is selling for just $9.99. Shipping is also free to many US addresses.  Prices, shipping and availability can change quickly. Please note that product prices and availability are subject to change. Prices and availability were accurate at the time this post was published; however, they may differ from those you see when you visit the product page. Check the product page for current price, description and availability.

Stainless Steel Carbonation Cap w/ 5/16″ Barb

More: Search eBay for Stainless Steel Carbonation Cap

Check sale or product page for current availability & pricing

Also: Kegerator Tips & Gear | Keg Repair Part #s | Recent Keg Finds | Build A Recirculating Draft Line Cleaning Pump | Mark II Keg and Carboy Cleaner Draft Line Cleaning Pump Conversion

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Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.

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