A series 1 with no amal valve, instead of there being an amal the turbo is plumped directly to the actuator via a bleed valve and the pipe that normaly runs from the metering head to the amal has been teed into a pip that runs to the oil breather

CheeRS
Dan

 

As opposed to the S2, S1 only has one joined outlet from the metering head to the solenoid valve and the oil breather. So yes, there is a tee as standard.