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

This stainless steel creamer style stout faucet forces beer through a restrictor plate delivering that dense, delicous creamy head for which Guinness is so famous. Also great for use with lower carbonated Ales and Stouts or Cold Brew Coffee. This is the faucet you would use with a Nitrogen/Co2 gas mixture in a Guinness style set up, but can also be used with a straight CO2 set up.

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