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Refering to the provied diagram, the connection between tap 5 and the receiver is a resivior to hold distillate whilst the receiver is replaced. Tap 5 accordinly is down the bottom of that connection. There is also an air inlet valve to allow the receiver to be repressurised so it can be removed. 211.26.133.177 ( talk) 02:36, 17 August 2022 (UTC) reply