At 38 F apply 18 PSIG. Do not remove anything from the coupler. You may want to add a foot of 3/16". Coors light is one of the highest carbonated beers in the US. This beer can be very sensitive if system is not perfect. During my stint with the National Draught program at Coors, we recommended using fittings no smaller than 1/4" ID.
Scott Zuhse, Instructor
Micro Matic Dispense Institute