Aston type two filler cap - Aluminium with roller catch, thread 3 1/2" BSP x 11 TPI
Aston type 2 - polished light alloy finish with roller catch. Internal thread 3 1/2" BSP (100mm, 3.93") x 11 TPI. Approx. 122mm x 162mm overall. Release lever stands up slightly at side roller catch. Original pattern fuel filler cap as used on Jaguar C & D type etc.