99 Savana Van a/c charge

just trying to charge the system (R134a)but find the only port to accept the quick disconnect of the charging gauge/hose assembly is on the accumulator drier(just below and right from the battery). Is this the port
I use or is there another inline port somewhere?
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The fittings for the low pressure and high pressure side are different sizes deliberately designed this way so you don't blow yourself up connecting a charging can to the wrong port.
Ted
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