HFS (R) TEE Fitting – Female FNPT 3-Way Tee Stainless (1/4″ Female NPT)
Of course you could do a lot of things with this fitting. One possible thing you could do is build a Spunding Valve. A Spunding Valve allows you to ferment under pressure, naturally and precisely carbonate in the keg, fix over-carbonated beers and more.
HFS (R) TEE Fitting – Female FNPT 3-Way Tee Stainless (1/4″ Female NPT) – note that multiple variations of this product may be available, as such a different version may appear at this link
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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.