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For all BSA and Triumph twin cylinder models and BSA / Triumph unit singles, the SRM Engineering CNC-machined stainless steel pressure release valves have a stainless body, stainless dome cap and stainless piston. Each one is hand assembled and checked for correct pressure blow off. Fits BSA A7, A10, A50, and A65 as well as Triumph T110, T120, T140, 5TA, 3TA, T100, 6T, TR6, Etc. Individually assembled and fully tested by SRM in the UK.