The ports are a different thread under those caps and sometimes the caps have " L H " on them .
The , high pressure line is the smaller of the two lines because the pressurized liquid doesn't need as large an inside diameter as the low pressure , vapor side of the system.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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