Where is the low pressure nipple on the 1993 Toyota 4 Runner what size thread adaptor is required?

IT'S EITHER ON THE ACCUMULATOR OR THE LINE THAT GOES TO IT.THE ACCUMULATOR LOOK LIKE A 4INCH X 8 INCH CAN,WITH A PRESSURE SWITCH OFF CENTER ON THE TOP.THE LINE GOES FROM THE COMPRESSOR TO THIS CAN,THAT IS CALLED THE SUCTION LINE (LOW PRESSURE) GOOD LUCK Im pasteing this a couple of places because its the right answer! P.S. be sure to use a guage! nipple adapters come in 2 sizes both in a r134 changeout kit