Triumph / BSA Twins Inlet Cam Breather Valves (1) - Choose Rotary Valve Type 1" then this part is exactly

then this part is exactly what you need

Comes with a nice finish but can easily polished to a mirror finish

Fits the Norton ES2 and Model 50 from 1957-1960

Adjusters will work with most Triumph / BSA pre-unit twins and unit twins with the 3-spring and 4-spring clutch

Triumph 350 & 500 twins (T90

Triumph / BSA Twins Inlet Cam Breather Valves (1) - Choose Rotary Valve Type 1" then this part is exactlyFor sale today are new & used Triumph BSA inlet camshaft breather valves. Breather valves where fitted to twin cylinder models on the drive side end of your inlet camshaft to aide engine breathing. We stock two types of valves under part numbers 70 2254, E2254, 70 5316, E5316 and 68 0101. Fits most Triumph and BSA unit twins and pre unit (Bonneville, T120, T100, A65, T110, etc) from approx 1944 1970. Check your parts book to ensure the best fitment.