This twin line brake valve is fitted on the front bulkhead of the engine bay from 1978 on as opposed to the single line valve which was fitted on the rear subframe. Known as PWDA valve.

Fixing bolt is 2.25" long UNF 1/4. The 4 Brake unions are all metric. Mounting hole at the top, end nut towards the centre of car. The valve was repositioned closer to bulk head when servo fitted 1988.