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Little brass fitting to adapt the air line

The tube style is first gen, m939 abs air dryer is second gen and the purest style pictured is the 3rd. I tried one of the tube ones that was like new it still didnt do anywheres near as good a job as the purest one.

I have the dryers. The bracket is a haldex universal bracket and there is a small adapter needed at the unloader line. You have to notch the bracket. I used to get plenty of moisture out when I drained my air tanks. Now there's little to none.

Do the cans move when you release the brake? Could be a frozen check valve or frozen moisture in a line. Do you still use the old tube with fins air dryer? They dont work very well.