Early two-way brass fuel tap. This would be perfect to mount in a chassis rail.
It is quite large; the distance between the mounting holes is 2-1/16''. The lever is about 2'' long.
I can send more photos on request, and I accept Paypal.
Large vacuum fuel feed system by Autovac mfg.Co.Ltd, Stockport /England. Serial No. 488755. Complete with suction and feed taps and mounting brackets / in good condition.