For a soft silicon o-ring that works well with all the 1/2 inch BSP and NPT fittings this will do the job nicely.
Silicone Oring for 1/2 BSP 20mm(ID)x2.5mm (BS117). This natural silicon o-ring has no colourants in it to leach into your brew. They are high temperature rated to 207C and are food grade.
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