Description 4x fuel injector “top hat” extensions. These fit in to a (typically Japonese) 11mm diameter fuel rail and accept 14mm O-ringed injectors such as Bosch EV6, EV14, Siemens DEKA, etc. Specification: – 4x supplied – 11mm O-ring top and 14mm diameter entry below – Total length: 23mm – Extends injector by approx. 14mm