OE in line brake modulator valve for the rear brakes. This part is listed for the TVR Chimaera and Griffith and moderates the pressure applied to the rear brakes. This pressure modulating valve has an M10 thread on both the input and output port to the rear axle and has a cut in pressure of approx 40 bar. If your pressure modulating valve has an M10 thread on the input port and M12 thread on the output port it is TVR J0148. TVR J0151 has a cut in pressure of approximately 35 bar after which it moderates the rear line pressure.