Low pressure Aircon Port Which one is it ?

[tjamesbo]

Not sure which is the Low pressure port on my aircon Pipes appear same size as does the valve and its so tight / crowded up front ( its the OM642 V6 ) its hard to see compressor pipes
anyone know my gut says its the one leading towards the bulkhead but thats a guess
Trying the STP leak seal lube and recharge system primed through the LP valve
Thanks Boyd

 

[Uncle Benz]

First pic is the low side

 

[tjamesbo]

Thanks My Guess / intuition was right thought it would be closer to the evaporator