nos amal pre monobloc 274 74/ 275 / 75 models possibly originally triumph 3t bsa triumph ariel norton ajs royal enfield threaded ring for air filter or air filter hose to push over thick walled cad plated steel 8 mm length internal dia. on thread = approx 25.7 mm (1") external dia approx 32 mm but will work with other makes enfield panther norton ariel ajs matchless triumph Carb shown is NOT included , to fit triumph triton tribsa BSA norton sunbeam PANTHER ARIEL AJS MATCHLESS velo etc etc ,
