Petrol (fuel / gas) adaptor/ reducer male 3/8 BSP to female to 1/4 BSP, brass (old fashioned parallel BSP thread not tapered), with seal (each). Has large enough hole in centre to fit fuel filter built into tap. Allows a tap to be stepped away from the tank to allow clearance for bolts and other obstructions. Ideal for converting large holes on BSA, Ariel ,early Triumph etc to standard 1/4 BSP tap. Neat looking, old style not the new chunky ugly ones.