TC clamp
€5.99
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1.5” cap with 1 bar (15 PSI) pressure relief valve (PRV). 100% stainless steel.
This valve can be used in the traditional way, as a safety measure in case of overpressure, but that's not all.
You can also attach it to the top of a Hop Bong with a 1.5" Tri-Clamp fitting to purge hops for an oxygen-free Dry Hop.
Data sheet