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Yeah I believe Qsilver7 is absolutely right on that.
The recharge/top up kit will only fit one port (filler is higher than the drain port as the lower drain port is used to vacuum drain if a garage with the right kit needs to completely drain the system for maintenance)
I’d also advise a cannister of oiler/sealer too, this contains a mixture of r134a and oils and other stuff that lubricates the o-rings etc in the system to stop them drying out and perishing.
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